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Misc/NEWS.d/next/Library/2026-01-18-17-29-29.gh-issue-144001.uWGYjV.rst

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+Add the ``ignorechars`` parameter to :func:`binascii.a2b_base64` and
+:func:`base64.b64decode`. When provided, only characters in this set will be
+silently ignored during decoding; other non-base64 characters will cause an
+error. This allows selective filtering of characters (e.g., ignoring
+whitespace while rejecting other invalid characters), similar to the existing
+``ignorechars`` parameter in :func:`base64.a85decode`.