Don't evict whole cache for large entries

[ericphanson]

Closes #37

[ericphanson]

added this so the return type is nothing independently of which branch we take. Note the return of _unsafe_index! isn't used anywhere in the codebase

[ericphanson]

counted this as a "feature", but I think it could also be seen as a bugfix (and thus a patch release)

[ericphanson]

Could you review @Jutho?

[Jutho]

Thanks for this very nice PR (and for the review reminder). Looks good to me. I will check whether the GitHub actions need any updating before tagging a the new version.

[Jutho]

1.5.0 is tagged, but it seems there is something wrong with tagbot configuration as new tags are not being registered on github. Even 1.4 was also missed as it only goes up to 1.3. Something to look into.

[ericphanson]

I see (https://github.com/JuliaCollections/LRUCache.jl/actions/runs/6195513321/job/16820375014#step:3:41):

Processing version v1.5.0 (ffc929f)
41
Generating changelog for version v1.5.0 (ffc929f)
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git@github.com: Permission denied (publickey).
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fatal: Could not read from remote repository.
44

45
Please make sure you have the correct access rights
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and the repository exists.

maybe the configuration or a key needs to be updated?