[3.10] gh-142145: Remove quadratic behavior in node ID cache clearing (GH-142146)#142213

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miss-islington wants to merge 4 commits intopython:3.10from

miss-islington:backport-08d8e18-3.10

Commits on Dec 3, 2025

gh-142145: Remove quadratic behavior in node ID cache clearing (GH-142146)

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miss-islington
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Commits on Dec 22, 2025

[3.14] gh-142754: Ensure that Element & Attr instances have the ownerDocument attribute (GH-142794) (#142818)

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gpshead
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gh-142145: relax the no-longer-quadratic test timing (GH-143030)
gpshead
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merge NEWS entries into one
gpshead
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