Lua table serde: allow non-string types as table keys #3140
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Summary
SUMMARY: Infrastructure "Lua mods can now use non-strings as keys in storage table"
Purpose of change
Fixes issue reported on Discord: if Lua table in mod_storage has a non-string key, the game would crash on save.
Describe the solution
Overhaul table de-serialization to support same values as keys do.
Describe alternatives you've considered
Forbidding non-strings as keys in storage
Testing
Added tests