diff --git a/crates/typst-eval/src/code.rs b/crates/typst-eval/src/code.rs
index a7b6b6f90..6768ccdc2 100644
--- a/crates/typst-eval/src/code.rs
+++ b/crates/typst-eval/src/code.rs
@@ -55,7 +55,7 @@ fn eval_code<'a>(
             _ => expr.eval(vm)?,
         };
 
-        output = ops::join(output, value).at(span)?;
+        output = ops::join(output, value, &mut (&mut vm.engine, span)).at(span)?;
 
         if let Some(event) = &vm.flow {
             warn_for_discarded_content(&mut vm.engine, event, &output);
diff --git a/crates/typst-eval/src/flow.rs b/crates/typst-eval/src/flow.rs
index b5ba487f5..0e7d3e63c 100644
--- a/crates/typst-eval/src/flow.rs
+++ b/crates/typst-eval/src/flow.rs
@@ -83,7 +83,8 @@ impl Eval for ast::WhileLoop<'_> {
             }
 
             let value = body.eval(vm)?;
-            output = ops::join(output, value).at(body.span())?;
+            let span = body.span();
+            output = ops::join(output, value, &mut (&mut vm.engine, span)).at(span)?;
 
             match vm.flow {
                 Some(FlowEvent::Break(_)) => {
@@ -129,7 +130,9 @@ impl Eval for ast::ForLoop<'_> {
 
                     let body = self.body();
                     let value = body.eval(vm)?;
-                    output = ops::join(output, value).at(body.span())?;
+                    let span = body.span();
+                    output =
+                        ops::join(output, value, &mut (&mut vm.engine, span)).at(span)?;
 
                     match vm.flow {
                         Some(FlowEvent::Break(_)) => {
diff --git a/crates/typst-eval/src/ops.rs b/crates/typst-eval/src/ops.rs
index ebbd67430..f2a8f6c64 100644
--- a/crates/typst-eval/src/ops.rs
+++ b/crates/typst-eval/src/ops.rs
@@ -1,4 +1,4 @@
-use typst_library::diag::{At, HintedStrResult, SourceResult};
+use typst_library::diag::{At, DeprecationSink, HintedStrResult, SourceResult};
 use typst_library::foundations::{ops, IntoValue, Value};
 use typst_syntax::ast::{self, AstNode};
 
@@ -23,22 +23,22 @@ impl Eval for ast::Binary<'_> {
 
     fn eval(self, vm: &mut Vm) -> SourceResult<Self::Output> {
         match self.op() {
-            ast::BinOp::Add => apply_binary(self, vm, ops::add),
+            ast::BinOp::Add => apply_binary_with_sink(self, vm, ops::add),
             ast::BinOp::Sub => apply_binary(self, vm, ops::sub),
             ast::BinOp::Mul => apply_binary(self, vm, ops::mul),
             ast::BinOp::Div => apply_binary(self, vm, ops::div),
             ast::BinOp::And => apply_binary(self, vm, ops::and),
             ast::BinOp::Or => apply_binary(self, vm, ops::or),
-            ast::BinOp::Eq => apply_binary(self, vm, ops::eq),
-            ast::BinOp::Neq => apply_binary(self, vm, ops::neq),
+            ast::BinOp::Eq => apply_binary_with_sink(self, vm, ops::eq),
+            ast::BinOp::Neq => apply_binary_with_sink(self, vm, ops::neq),
             ast::BinOp::Lt => apply_binary(self, vm, ops::lt),
             ast::BinOp::Leq => apply_binary(self, vm, ops::leq),
             ast::BinOp::Gt => apply_binary(self, vm, ops::gt),
             ast::BinOp::Geq => apply_binary(self, vm, ops::geq),
-            ast::BinOp::In => apply_binary(self, vm, ops::in_),
-            ast::BinOp::NotIn => apply_binary(self, vm, ops::not_in),
+            ast::BinOp::In => apply_binary_with_sink(self, vm, ops::in_),
+            ast::BinOp::NotIn => apply_binary_with_sink(self, vm, ops::not_in),
             ast::BinOp::Assign => apply_assignment(self, vm, |_, b| Ok(b)),
-            ast::BinOp::AddAssign => apply_assignment(self, vm, ops::add),
+            ast::BinOp::AddAssign => apply_assignment_with_sink(self, vm, ops::add),
             ast::BinOp::SubAssign => apply_assignment(self, vm, ops::sub),
             ast::BinOp::MulAssign => apply_assignment(self, vm, ops::mul),
             ast::BinOp::DivAssign => apply_assignment(self, vm, ops::div),
@@ -65,6 +65,18 @@ fn apply_binary(
     op(lhs, rhs).at(binary.span())
 }
 
+/// Apply a basic binary operation, with the possiblity of deprecations.
+fn apply_binary_with_sink(
+    binary: ast::Binary,
+    vm: &mut Vm,
+    op: impl Fn(Value, Value, &mut dyn DeprecationSink) -> HintedStrResult<Value>,
+) -> SourceResult<Value> {
+    let span = binary.span();
+    let lhs = binary.lhs().eval(vm)?;
+    let rhs = binary.rhs().eval(vm)?;
+    op(lhs, rhs, &mut (&mut vm.engine, span)).at(span)
+}
+
 /// Apply an assignment operation.
 fn apply_assignment(
     binary: ast::Binary,
@@ -89,3 +101,23 @@ fn apply_assignment(
     *location = op(lhs, rhs).at(binary.span())?;
     Ok(Value::None)
 }
+
+/// Apply an assignment operation, with the possiblity of deprecations.
+fn apply_assignment_with_sink(
+    binary: ast::Binary,
+    vm: &mut Vm,
+    op: fn(Value, Value, &mut dyn DeprecationSink) -> HintedStrResult<Value>,
+) -> SourceResult<Value> {
+    let rhs = binary.rhs().eval(vm)?;
+    let location = binary.lhs().access(vm)?;
+    let lhs = std::mem::take(&mut *location);
+    let mut sink = vec![];
+    let span = binary.span();
+    *location = op(lhs, rhs, &mut (&mut sink, span)).at(span)?;
+    if !sink.is_empty() {
+        for warning in sink {
+            vm.engine.sink.warn(warning);
+        }
+    }
+    Ok(Value::None)
+}
diff --git a/crates/typst-library/src/diag.rs b/crates/typst-library/src/diag.rs
index 49cbd02c6..bf8dc0e4f 100644
--- a/crates/typst-library/src/diag.rs
+++ b/crates/typst-library/src/diag.rs
@@ -232,18 +232,42 @@ impl From<SyntaxError> for SourceDiagnostic {
 /// Destination for a deprecation message when accessing a deprecated value.
 pub trait DeprecationSink {
     /// Emits the given deprecation message into this sink.
-    fn emit(self, message: &str);
+    fn emit(&mut self, message: &str);
+
+    /// Emits the given deprecation message into this sink, with the given
+    /// hints.
+    fn emit_with_hints(&mut self, message: &str, hints: &[&str]);
 }
 
 impl DeprecationSink for () {
-    fn emit(self, _: &str) {}
+    fn emit(&mut self, _: &str) {}
+    fn emit_with_hints(&mut self, _: &str, _: &[&str]) {}
+}
+
+impl DeprecationSink for (&mut Vec<SourceDiagnostic>, Span) {
+    fn emit(&mut self, message: &str) {
+        self.0.push(SourceDiagnostic::warning(self.1, message));
+    }
+
+    fn emit_with_hints(&mut self, message: &str, hints: &[&str]) {
+        self.0.push(
+            SourceDiagnostic::warning(self.1, message)
+                .with_hints(hints.iter().copied().map(Into::into)),
+        );
+    }
 }
 
 impl DeprecationSink for (&mut Engine<'_>, Span) {
-    /// Emits the deprecation message as a warning.
-    fn emit(self, message: &str) {
+    fn emit(&mut self, message: &str) {
         self.0.sink.warn(SourceDiagnostic::warning(self.1, message));
     }
+
+    fn emit_with_hints(&mut self, message: &str, hints: &[&str]) {
+        self.0.sink.warn(
+            SourceDiagnostic::warning(self.1, message)
+                .with_hints(hints.iter().copied().map(Into::into)),
+        );
+    }
 }
 
 /// A part of a diagnostic's [trace](SourceDiagnostic::trace).
diff --git a/crates/typst-library/src/foundations/array.rs b/crates/typst-library/src/foundations/array.rs
index aad7266bc..8c921a13d 100644
--- a/crates/typst-library/src/foundations/array.rs
+++ b/crates/typst-library/src/foundations/array.rs
@@ -9,7 +9,9 @@ use serde::{Deserialize, Serialize};
 use smallvec::SmallVec;
 use typst_syntax::{Span, Spanned};
 
-use crate::diag::{bail, At, HintedStrResult, SourceDiagnostic, SourceResult, StrResult};
+use crate::diag::{
+    bail, At, DeprecationSink, HintedStrResult, SourceDiagnostic, SourceResult, StrResult,
+};
 use crate::engine::Engine;
 use crate::foundations::{
     cast, func, ops, repr, scope, ty, Args, Bytes, CastInfo, Context, Dict, FromValue,
@@ -143,6 +145,11 @@ impl Array {
 
         Ok(self.iter().cloned().cycle().take(count).collect())
     }
+
+    /// The internal implementation of [`Array::contains`].
+    pub fn contains_impl(&self, value: &Value, sink: &mut dyn DeprecationSink) -> bool {
+        self.0.iter().any(|v| ops::equal(v, value, sink))
+    }
 }
 
 #[scope]
@@ -290,10 +297,12 @@ impl Array {
     #[func]
     pub fn contains(
         &self,
+        engine: &mut Engine,
+        span: Span,
         /// The value to search for.
         value: Value,
     ) -> bool {
-        self.0.contains(&value)
+        self.contains_impl(&value, &mut (engine, span))
     }
 
     /// Searches for an item for which the given function returns `{true}` and
@@ -576,6 +585,8 @@ impl Array {
     #[func]
     pub fn sum(
         self,
+        engine: &mut Engine,
+        span: Span,
         /// What to return if the array is empty. Must be set if the array can
         /// be empty.
         #[named]
@@ -587,7 +598,7 @@ impl Array {
             .or(default)
             .ok_or("cannot calculate sum of empty array with no default")?;
         for item in iter {
-            acc = ops::add(acc, item)?;
+            acc = ops::add(acc, item, &mut (&mut *engine, span))?;
         }
         Ok(acc)
     }
@@ -686,6 +697,8 @@ impl Array {
     #[func]
     pub fn join(
         self,
+        engine: &mut Engine,
+        span: Span,
         /// A value to insert between each item of the array.
         #[default]
         separator: Option<Value>,
@@ -701,13 +714,18 @@ impl Array {
         for (i, value) in self.into_iter().enumerate() {
             if i > 0 {
                 if i + 1 == len && last.is_some() {
-                    result = ops::join(result, last.take().unwrap())?;
+                    result = ops::join(
+                        result,
+                        last.take().unwrap(),
+                        &mut (&mut *engine, span),
+                    )?;
                 } else {
-                    result = ops::join(result, separator.clone())?;
+                    result =
+                        ops::join(result, separator.clone(), &mut (&mut *engine, span))?;
                 }
             }
 
-            result = ops::join(result, value)?;
+            result = ops::join(result, value, &mut (&mut *engine, span))?;
         }
 
         Ok(result)
@@ -862,13 +880,14 @@ impl Array {
         self,
         engine: &mut Engine,
         context: Tracked<Context>,
+        span: Span,
         /// If given, applies this function to the elements in the array to
         /// determine the keys to deduplicate by.
         #[named]
         key: Option<Func>,
     ) -> SourceResult<Array> {
         let mut out = EcoVec::with_capacity(self.0.len());
-        let mut key_of = |x: Value| match &key {
+        let key_of = |engine: &mut Engine, x: Value| match &key {
             // NOTE: We are relying on `comemo`'s memoization of function
             // evaluation to not excessively reevaluate the `key`.
             Some(f) => f.call(engine, context, [x]),
@@ -879,14 +898,18 @@ impl Array {
         // 1. We would like to preserve the order of the elements.
         // 2. We cannot hash arbitrary `Value`.
         'outer: for value in self {
-            let key = key_of(value.clone())?;
+            let key = key_of(&mut *engine, value.clone())?;
             if out.is_empty() {
                 out.push(value);
                 continue;
             }
 
             for second in out.iter() {
-                if ops::equal(&key, &key_of(second.clone())?) {
+                if ops::equal(
+                    &key,
+                    &key_of(&mut *engine, second.clone())?,
+                    &mut (&mut *engine, span),
+                ) {
                     continue 'outer;
                 }
             }
diff --git a/crates/typst-library/src/foundations/ops.rs b/crates/typst-library/src/foundations/ops.rs
index 6c2408446..4fa3c99ef 100644
--- a/crates/typst-library/src/foundations/ops.rs
+++ b/crates/typst-library/src/foundations/ops.rs
@@ -5,7 +5,7 @@ use std::cmp::Ordering;
 use ecow::eco_format;
 use typst_utils::Numeric;
 
-use crate::diag::{bail, HintedStrResult, StrResult};
+use crate::diag::{bail, DeprecationSink, HintedStrResult, StrResult};
 use crate::foundations::{
     format_str, Datetime, IntoValue, Regex, Repr, SymbolElem, Value,
 };
@@ -21,7 +21,7 @@ macro_rules! mismatch {
 }
 
 /// Join a value with another value.
-pub fn join(lhs: Value, rhs: Value) -> StrResult<Value> {
+pub fn join(lhs: Value, rhs: Value, sink: &mut dyn DeprecationSink) -> StrResult<Value> {
     use Value::*;
     Ok(match (lhs, rhs) {
         (a, None) => a,
@@ -39,6 +39,17 @@ pub fn join(lhs: Value, rhs: Value) -> StrResult<Value> {
         (Array(a), Array(b)) => Array(a + b),
         (Dict(a), Dict(b)) => Dict(a + b),
         (Args(a), Args(b)) => Args(a + b),
+
+        // Type compatibility.
+        (Type(a), Str(b)) => {
+            warn_type_str_join(sink);
+            Str(format_str!("{a}{b}"))
+        }
+        (Str(a), Type(b)) => {
+            warn_type_str_join(sink);
+            Str(format_str!("{a}{b}"))
+        }
+
         (a, b) => mismatch!("cannot join {} with {}", a, b),
     })
 }
@@ -88,7 +99,11 @@ pub fn neg(value: Value) -> HintedStrResult<Value> {
 }
 
 /// Compute the sum of two values.
-pub fn add(lhs: Value, rhs: Value) -> HintedStrResult<Value> {
+pub fn add(
+    lhs: Value,
+    rhs: Value,
+    sink: &mut dyn DeprecationSink,
+) -> HintedStrResult<Value> {
     use Value::*;
     Ok(match (lhs, rhs) {
         (a, None) => a,
@@ -156,6 +171,16 @@ pub fn add(lhs: Value, rhs: Value) -> HintedStrResult<Value> {
         (Datetime(a), Duration(b)) => Datetime(a + b),
         (Duration(a), Datetime(b)) => Datetime(b + a),
 
+        // Type compatibility.
+        (Type(a), Str(b)) => {
+            warn_type_str_add(sink);
+            Str(format_str!("{a}{b}"))
+        }
+        (Str(a), Type(b)) => {
+            warn_type_str_add(sink);
+            Str(format_str!("{a}{b}"))
+        }
+
         (Dyn(a), Dyn(b)) => {
             // Alignments can be summed.
             if let (Some(&a), Some(&b)) =
@@ -394,13 +419,21 @@ pub fn or(lhs: Value, rhs: Value) -> HintedStrResult<Value> {
 }
 
 /// Compute whether two values are equal.
-pub fn eq(lhs: Value, rhs: Value) -> HintedStrResult<Value> {
-    Ok(Value::Bool(equal(&lhs, &rhs)))
+pub fn eq(
+    lhs: Value,
+    rhs: Value,
+    sink: &mut dyn DeprecationSink,
+) -> HintedStrResult<Value> {
+    Ok(Value::Bool(equal(&lhs, &rhs, sink)))
 }
 
 /// Compute whether two values are unequal.
-pub fn neq(lhs: Value, rhs: Value) -> HintedStrResult<Value> {
-    Ok(Value::Bool(!equal(&lhs, &rhs)))
+pub fn neq(
+    lhs: Value,
+    rhs: Value,
+    sink: &mut dyn DeprecationSink,
+) -> HintedStrResult<Value> {
+    Ok(Value::Bool(!equal(&lhs, &rhs, sink)))
 }
 
 macro_rules! comparison {
@@ -419,7 +452,7 @@ comparison!(gt, ">", Ordering::Greater);
 comparison!(geq, ">=", Ordering::Greater | Ordering::Equal);
 
 /// Determine whether two values are equal.
-pub fn equal(lhs: &Value, rhs: &Value) -> bool {
+pub fn equal(lhs: &Value, rhs: &Value, sink: &mut dyn DeprecationSink) -> bool {
     use Value::*;
     match (lhs, rhs) {
         // Compare reflexively.
@@ -463,6 +496,12 @@ pub fn equal(lhs: &Value, rhs: &Value) -> bool {
             rat == rel.rel && rel.abs.is_zero()
         }
 
+        // Type compatibility.
+        (Type(ty), Str(str)) | (Str(str), Type(ty)) => {
+            warn_type_str_equal(sink);
+            ty.compat_name() == str.as_str()
+        }
+
         _ => false,
     }
 }
@@ -534,8 +573,12 @@ fn try_cmp_arrays(a: &[Value], b: &[Value]) -> StrResult<Ordering> {
 }
 
 /// Test whether one value is "in" another one.
-pub fn in_(lhs: Value, rhs: Value) -> HintedStrResult<Value> {
-    if let Some(b) = contains(&lhs, &rhs) {
+pub fn in_(
+    lhs: Value,
+    rhs: Value,
+    sink: &mut dyn DeprecationSink,
+) -> HintedStrResult<Value> {
+    if let Some(b) = contains(&lhs, &rhs, sink) {
         Ok(Value::Bool(b))
     } else {
         mismatch!("cannot apply 'in' to {} and {}", lhs, rhs)
@@ -543,8 +586,12 @@ pub fn in_(lhs: Value, rhs: Value) -> HintedStrResult<Value> {
 }
 
 /// Test whether one value is "not in" another one.
-pub fn not_in(lhs: Value, rhs: Value) -> HintedStrResult<Value> {
-    if let Some(b) = contains(&lhs, &rhs) {
+pub fn not_in(
+    lhs: Value,
+    rhs: Value,
+    sink: &mut dyn DeprecationSink,
+) -> HintedStrResult<Value> {
+    if let Some(b) = contains(&lhs, &rhs, sink) {
         Ok(Value::Bool(!b))
     } else {
         mismatch!("cannot apply 'not in' to {} and {}", lhs, rhs)
@@ -552,13 +599,27 @@ pub fn not_in(lhs: Value, rhs: Value) -> HintedStrResult<Value> {
 }
 
 /// Test for containment.
-pub fn contains(lhs: &Value, rhs: &Value) -> Option<bool> {
+pub fn contains(
+    lhs: &Value,
+    rhs: &Value,
+    sink: &mut dyn DeprecationSink,
+) -> Option<bool> {
     use Value::*;
     match (lhs, rhs) {
         (Str(a), Str(b)) => Some(b.as_str().contains(a.as_str())),
         (Dyn(a), Str(b)) => a.downcast::<Regex>().map(|regex| regex.is_match(b)),
         (Str(a), Dict(b)) => Some(b.contains(a)),
-        (a, Array(b)) => Some(b.contains(a.clone())),
+        (a, Array(b)) => Some(b.contains_impl(a, sink)),
+
+        // Type compatibility.
+        (Type(a), Str(b)) => {
+            warn_type_in_str(sink);
+            Some(b.as_str().contains(a.compat_name()))
+        }
+        (Type(a), Dict(b)) => {
+            warn_type_in_dict(sink);
+            Some(b.contains(a.compat_name()))
+        }
 
         _ => Option::None,
     }
@@ -568,3 +629,46 @@ pub fn contains(lhs: &Value, rhs: &Value) -> Option<bool> {
 fn too_large() -> &'static str {
     "value is too large"
 }
+
+#[cold]
+fn warn_type_str_add(sink: &mut dyn DeprecationSink) {
+    sink.emit_with_hints(
+        "adding strings and types is deprecated",
+        &["convert the type to a string with `str` first"],
+    );
+}
+
+#[cold]
+fn warn_type_str_join(sink: &mut dyn DeprecationSink) {
+    sink.emit_with_hints(
+        "joining strings and types is deprecated",
+        &["convert the type to a string with `str` first"],
+    );
+}
+
+#[cold]
+fn warn_type_str_equal(sink: &mut dyn DeprecationSink) {
+    sink.emit_with_hints(
+        "comparing strings with types is deprecated",
+        &[
+            "compare with the literal type instead",
+            "this comparison will always return `false` in future Typst releases",
+        ],
+    );
+}
+
+#[cold]
+fn warn_type_in_str(sink: &mut dyn DeprecationSink) {
+    sink.emit_with_hints(
+        "checking whether a type is contained in a string is deprecated",
+        &["this compatibility behavior only exists because `type` used to return a string"],
+    );
+}
+
+#[cold]
+fn warn_type_in_dict(sink: &mut dyn DeprecationSink) {
+    sink.emit_with_hints(
+        "checking whether a type is contained in a dictionary is deprecated",
+        &["this compatibility behavior only exists because `type` used to return a string"],
+    );
+}
diff --git a/crates/typst-library/src/foundations/scope.rs b/crates/typst-library/src/foundations/scope.rs
index e1ce61b8a..ad6da323d 100644
--- a/crates/typst-library/src/foundations/scope.rs
+++ b/crates/typst-library/src/foundations/scope.rs
@@ -300,7 +300,7 @@ impl Binding {
     /// As the `sink`
     /// - pass `()` to ignore the message.
     /// - pass `(&mut engine, span)` to emit a warning into the engine.
-    pub fn read_checked(&self, sink: impl DeprecationSink) -> &Value {
+    pub fn read_checked(&self, mut sink: impl DeprecationSink) -> &Value {
         if let Some(message) = self.deprecation {
             sink.emit(message);
         }
diff --git a/crates/typst-library/src/foundations/ty.rs b/crates/typst-library/src/foundations/ty.rs
index 40f7003c3..4747775ac 100644
--- a/crates/typst-library/src/foundations/ty.rs
+++ b/crates/typst-library/src/foundations/ty.rs
@@ -44,6 +44,16 @@ use crate::foundations::{
 /// #type(int) \
 /// #type(type)
 /// ```
+///
+/// # Compatibility
+/// In Typst 0.7 and lower, the `type` function returned a string instead of a
+/// type. Compatibility with the old way will remain until Typst 0.14 to give
+/// package authors time to upgrade.
+///
+/// - Checks like `{int == "integer"}` evaluate to `{true}`
+/// - Adding/joining a type and string will yield a string
+/// - The `{in}` operator on a type and a dictionary will evaluate to `{true}`
+///   if the dictionary has a string key matching the type's name
 #[ty(scope, cast)]
 #[derive(Copy, Clone, Eq, PartialEq, Hash)]
 pub struct Type(Static<NativeTypeData>);
@@ -106,6 +116,14 @@ impl Type {
     }
 }
 
+// Type compatibility.
+impl Type {
+    /// The type's backward-compatible name.
+    pub fn compat_name(&self) -> &str {
+        self.long_name()
+    }
+}
+
 #[scope]
 impl Type {
     /// Determines a value's type.
diff --git a/crates/typst-library/src/foundations/value.rs b/crates/typst-library/src/foundations/value.rs
index 854c2486e..ba5b14730 100644
--- a/crates/typst-library/src/foundations/value.rs
+++ b/crates/typst-library/src/foundations/value.rs
@@ -292,7 +292,8 @@ impl Repr for Value {
 
 impl PartialEq for Value {
     fn eq(&self, other: &Self) -> bool {
-        ops::equal(self, other)
+        // No way to emit deprecation warnings here :(
+        ops::equal(self, other, &mut ())
     }
 }
 
diff --git a/docs/changelog/0.13.0.md b/docs/changelog/0.13.0.md
index 78a8f897e..5639f95be 100644
--- a/docs/changelog/0.13.0.md
+++ b/docs/changelog/0.13.0.md
@@ -313,6 +313,9 @@ feature flag.
   functions directly accepting both paths and bytes
 - The `sect` and its variants in favor of `inter`, and `integral.sect` in favor
   of `integral.inter`
+- The compatibility behavior of type/str comparisons (e.g. `{int == "integer"}`)
+  which was temporarily introduced in Typst 0.8 now emits warnings. It will be
+  removed in Typst 0.14.
 
 ## Removals
 - Removed `style` function and `styles` argument of [`measure`], use a [context]
@@ -324,9 +327,6 @@ feature flag.
 - Removed compatibility behavior where [`counter.display`] worked without
   [context] **(Breaking change)**
 - Removed compatibility behavior of [`locate`] **(Breaking change)**
-- Removed compatibility behavior of type/str comparisons
-  (e.g. `{int == "integer"}`) which was temporarily introduced in Typst 0.8
-  **(Breaking change)**
 
 ## Development
 - The `typst::compile` function is now generic and can return either a
diff --git a/tests/src/world.rs b/tests/src/world.rs
index 5c2678328..56ebc8683 100644
--- a/tests/src/world.rs
+++ b/tests/src/world.rs
@@ -251,6 +251,6 @@ fn lines(
     (1..=count)
         .map(|n| numbering.apply(engine, context, &[n]))
         .collect::<SourceResult<Array>>()?
-        .join(Some('\n'.into_value()), None)
+        .join(engine, span, Some('\n'.into_value()), None)
         .at(span)
 }
diff --git a/tests/suite/foundations/type.typ b/tests/suite/foundations/type.typ
index 068b858de..60f9d0ef2 100644
--- a/tests/suite/foundations/type.typ
+++ b/tests/suite/foundations/type.typ
@@ -2,6 +2,60 @@
 #test(type(1), int)
 #test(type(ltr), direction)
 #test(type(10 / 3), float)
+#test(type(10) == int, true)
+#test(type(10) != int, false)
+
+--- type-string-compatibility-add ---
+// Warning: 7-23 adding strings and types is deprecated
+// Hint: 7-23 convert the type to a string with `str` first
+#test("is " + type(10), "is integer")
+// Warning: 7-23 adding strings and types is deprecated
+// Hint: 7-23 convert the type to a string with `str` first
+#test(type(10) + " is", "integer is")
+
+--- type-string-compatibility-join ---
+// Warning: 16-24 joining strings and types is deprecated
+// Hint: 16-24 convert the type to a string with `str` first
+#test({ "is "; type(10) }, "is integer")
+// Warning: 19-24 joining strings and types is deprecated
+// Hint: 19-24 convert the type to a string with `str` first
+#test({ type(10); " is" }, "integer is")
+
+--- type-string-compatibility-equal ---
+// Warning: 7-28 comparing strings with types is deprecated
+// Hint: 7-28 compare with the literal type instead
+// Hint: 7-28 this comparison will always return `false` in future Typst releases
+#test(type(10) == "integer", true)
+// Warning: 7-26 comparing strings with types is deprecated
+// Hint: 7-26 compare with the literal type instead
+// Hint: 7-26 this comparison will always return `false` in future Typst releases
+#test(type(10) != "float", true)
+
+--- type-string-compatibility-in-array ---
+// Warning: 7-35 comparing strings with types is deprecated
+// Hint: 7-35 compare with the literal type instead
+// Hint: 7-35 this comparison will always return `false` in future Typst releases
+#test(int in ("integer", "string"), true)
+// Warning: 7-37 comparing strings with types is deprecated
+// Hint: 7-37 compare with the literal type instead
+// Hint: 7-37 this comparison will always return `false` in future Typst releases
+#test(float in ("integer", "string"), false)
+
+--- type-string-compatibility-in-str ---
+// Warning: 7-35 checking whether a type is contained in a string is deprecated
+// Hint: 7-35 this compatibility behavior only exists because `type` used to return a string
+#test(int in "integers or strings", true)
+// Warning: 7-35 checking whether a type is contained in a string is deprecated
+// Hint: 7-35 this compatibility behavior only exists because `type` used to return a string
+#test(str in "integers or strings", true)
+// Warning: 7-37 checking whether a type is contained in a string is deprecated
+// Hint: 7-37 this compatibility behavior only exists because `type` used to return a string
+#test(float in "integers or strings", false)
+
+--- type-string-compatibility-in-dict ---
+// Warning: 7-37 checking whether a type is contained in a dictionary is deprecated
+// Hint: 7-37 this compatibility behavior only exists because `type` used to return a string
+#test(int in (integer: 1, string: 2), true)
 
 --- issue-3110-type-constructor ---
 // Let the error message report the type name.