fix: detection of keys within objects

[RebeccaStevens]

fix #204

[vitaly-t]

Great job as always, thank you!!!

You were just 1 minute late to make it into v2.8.0-beta.1 :smile:

I will make beta 2 ;) b.t.w. this is from master, not to confuse with the temporary 2.8.0-beta.0 which came from dev.

[codecov-commenter]

Codecov Report

Base: 99.57% // Head: 99.51% // Decreases project coverage by -0.05% :warning:

Coverage data is based on head (0ac2886) compared to base (b4c3272). Patch coverage: 80.00% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #207 +/- ## ========================================== - Coverage 99.57% 99.51% -0.06% ========================================== Files 50 50 Lines 1655 1657 +2 Branches 344 345 +1 ========================================== + Hits 1648 1649 +1 - Misses 2 3 +1 Partials 5 5 ``` | [Impacted Files](https://codecov.io/gh/vitaly-t/iter-ops/pull/207?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | Coverage Δ | | |---|---|---| | [src/typeguards.ts](https://codecov.io/gh/vitaly-t/iter-ops/pull/207/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-c3JjL3R5cGVndWFyZHMudHM=) | `96.29% <80.00%> (-3.71%)` | :arrow_down: | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None)

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