Normalize resetting schema cache version for YAML and Marshal #38564
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When dumping the schema cache, we first call clear! which resets everything, including setting the @Version to nil. Dumping with YAML dumps the correct version, but doesn't actually update the instance variable. Dumping with Marshal writes the variable. This change makes it more consistent between the two strategies. Also, for codebases that use an alternate versioning strategy, they only need to overwrite reset_version! rather than overwriting the serialization method.
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Extract a method to reset the schema cache to make serialization more consistent between YAML and Marshal.
Summary
When dumping the schema cache, we first call clear! which resets
everything, including setting the @Version to nil.
Dumping with YAML dumps the correct version, but doesn't actually
update the instance variable.
Dumping with Marshal writes the variable.
This change makes it more consistent between the two strategies.
Also, for codebases (such as GitHub) that use an alternate versioning strategy for the schema cache, they only need to overwrite reset_version! rather than overwriting the serialization method.