Tamir Duberstein 2e65f4e3ac Initialize cache directory in isolation ...

Creating and initializing the cache directory is interruptible; this
avoids a pathological case where interrupting a cache write can cause
the cache directory to never be properly initialized with its supporting
files.

Unify `Cache.mkdir` with `Cache.set` while I'm here so the former also
properly initializes the cache directory.

Closes #12167.

2024-04-03 16:26:43 +01:00

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