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Add _typeshed cooldown period for 3rd-party stubs #16077

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Add _typeshed cooldown period for 3rd-party stubs #16077

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9 changes: 9 additions & 0 deletions stdlib/_typeshed/README.md
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Expand Up @@ -32,3 +32,12 @@ removed or changed in an incompatible way for at least one year.
Before making such a change, the "stable" moniker will be removed
and we will mark the type in question as deprecated. No guarantees
are made about unmarked types.

## Use in 3rd-party Packages (`stubs`)

The `_typeshed` module is usually vendored by type checkers. To ensure that
type checkers have a chance to pick up changes to this module, items added
to `_typeshed` (or its submodules) have a two month cooldown period before
they can be used in third-party stubs. For example, if `_typeshed.Fruzzle`
is added on 2026-07-15, it can't be used before 2026-09-15. This restriction
does not apply to standard library stubs.