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[3.12] gh-143925: Reject control characters in data: URL mediatypes (#144113)

* [3.12] gh-143925: Reject control characters in data: URL mediatypes
(cherry picked from commit f25509e78e8be6ea73c811ac2b8c928c28841b9f)
(cherry picked from commit 2c9c746077d8119b5bcf5142316992e464594946)

Co-authored-by: Seth Michael Larson <seth@python.org>

* Remove "ExtraAssertations"
S
Seth Michael Larson committed
4ed11d3cd288e6b90196a15c5a825a45d318fe47
Parent: 4802b96
Committed by GitHub <noreply@github.com> on 1/25/2026, 5:05:57 PM