Set eqeqeq rule to always and clarify type checks

[2wheeh]

I tried to improve readability and type safety.

Changes

• Set eqeqeq eslint rule to always, which forces ===, !== instead of ==, !=.
• Simplified some assertions which has double negation around invariant.
• Tweaked some types and removed unnecessary type checks.

Further steps

• Unifying some unnecessary undefined and null where one of both would suffice.
• Developing a general method to infer correct types from arrays or objects considering when index or key is not valid. -> --noUncheckedIndexedAccess introduced in TS4.1 is for this.
• Implementing proper handling for __lexical** fields on the global namespace (mostly with @ts-expect-error: internal field), similar to the way in devtools.

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