invoke type casts default values

CHANGES.rst

@@ -9,6 +9,8 @@ Unreleased
     paths. :issue:`2088`
 -   Importing ``readline`` does not cause the ``confirm()`` prompt to
     disappear when pressing backspace. :issue:`2092`
+-   Any default values injected by ``invoke()`` are cast to the
+    corresponding parameter's type. :issue:`2089, 2090`
 
 
 Version 8.0.2

src/click/core.py

@@ -739,7 +739,9 @@ def invoke(
 
             for param in other_cmd.params:
                 if param.name not in kwargs and param.expose_value:
-                    kwargs[param.name] = param.get_default(ctx)  # type: ignore
+                    kwargs[param.name] = param.type_cast_value(  # type: ignore
+                        ctx, param.get_default(ctx)
+                    )
 
             # Track all kwargs as params, so that forward() will pass
             # them on in subsequent calls.

tests/test_commands.py

@@ -246,15 +246,17 @@ def cli(ctx):
         return ctx.invoke(other_cmd)
 
     @click.command()
-    @click.option("--foo", type=click.INT, default=42)
+    @click.option("-a", type=click.INT, default=42)
+    @click.option("-b", type=click.INT, default="15")
+    @click.option("-c", multiple=True)
     @click.pass_context
-    def other_cmd(ctx, foo):
-        assert ctx.info_name == "other-cmd"
-        click.echo(foo)
+    def other_cmd(ctx, a, b, c):
+        return ctx.info_name, a, b, c
 
-    result = runner.invoke(cli, [])
-    assert not result.exception
-    assert result.output == "42\n"
+    result = runner.invoke(cli, standalone_mode=False)
+    # invoke should type cast default values, str becomes int, empty
+    # multiple should be empty tuple instead of None
+    assert result.return_value == ("other-cmd", 42, 15, ())
 
 
 def test_invoked_subcommand(runner):