What do restore-keys add to an actions/cache step?

Question

Accepted Answer

Ordered prefixes so a partial cache is restored when the exact primary key produces a miss — restore-keys are ordered prefixes that restore the most recent partial match when the exact key misses — they are prefixes not regex (and are not "fallback-keys"), keys are never rounded to a nearest entry, and key: takes a single value, not an array.

Answer

Regex patterns so any cache whose key matches the pattern is restored when the primary key misses

Answer

A shorter key so the cache action rounds it to the nearest saved entry when the primary key misses

Answer

Extra key values in an array so the action tries each one in turn until one of the caches hits

What do restore-keys add to an actions/cache step?

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