M. J. Fromberger 14322713a5 ipn/ipnlocal/netmapcache: ensure cache updates preserve unchanged data (#18590) ...

Found by @cmol. When rewriting the same value into the cache, we were dropping
the unchanged keys, resulting in the cache being pruned incorrectly.
Also update the tests to catch this.

Updates #12639

Change-Id: Iab67e444eb7ddc22ccc680baa2f6a741a00eb325
Signed-off-by: M. J. Fromberger <fromberger@tailscale.com>

2026-02-03 07:55:41 -08:00

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