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feat!: turn on noUncheckedIndexedAccess for libraries #36

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See https://www.semver-ts.org/formal-spec/5-compiler-considerations.html#strictness for the arguments for turning on noUncheckedIndexedAccess for libraries.

In short, it helps prevent shipping accidental breaking type changes to library consumers.

(Note the link also suggests turning on exactOptionalPropertyTypes, but I still have doubts about it, as it would not be helpful without a specific coding style, which is hard to enforce.)

See https://www.semver-ts.org/formal-spec/5-compiler-considerations.html#strictness
for the arguments for turning on noUncheckedIndexedAccess for libraries.

In short, it helps prevent shipping accidental breaking type changes to
library consumers.

(Note the link also suggests turning on `exactOptionalPropertyTypes`,
but I still have doubts about it, as it would not be helpful without
a specific coding style, which is hard to enforce.)
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