Import upstream CPython branch '3.14'

Summary:
Python `3.14.0rc2+` (`3.14`) was **published** on 2025-08-19 11:27:36+00:00.

# Commit Info

Base: (`3.14.0rc2+`) - `5034b6491a92d2019d1611c1adb02f682b847630` (commit date: 2025-08-18 21:21:55+00:00)
Imported: (`3.14.0rc2+`) - `3.14` (commit date: 2025-08-19 11:27:36+00:00)

Reviewed By: itamaro

Differential Revision: D80613292

fbshipit-source-id: 6578e946f9ef350e282a34b0af37b7a93eab37a4

Author: generatedunixname1734921407115435

Doc/library/asyncio-eventloop.rst

@@ -304,6 +304,12 @@ clocks to track time.
    custom :class:`contextvars.Context` for the *callback* to run in.
    The current context is used when no *context* is provided.
 
+   .. note::
+
+      For performance, callbacks scheduled with :meth:`loop.call_later`
+      may run up to one clock-resolution early (see
+      ``time.get_clock_info('monotonic').resolution``).
+
    .. versionchanged:: 3.7
       The *context* keyword-only parameter was added. See :pep:`567`
       for more details.
@@ -324,6 +330,12 @@ clocks to track time.
    An instance of :class:`asyncio.TimerHandle` is returned which can
    be used to cancel the callback.
 
+   .. note::
+
+      For performance, callbacks scheduled with :meth:`loop.call_at`
+      may run up to one clock-resolution early (see
+      ``time.get_clock_info('monotonic').resolution``).
+
    .. versionchanged:: 3.7
       The *context* keyword-only parameter was added. See :pep:`567`
       for more details.