fixes #273: nested arrays are not always unwound

[jose-cabral]

Background Information

• Fixes issue(s): [bug]: Nested arrays are not unwound from 3+ levels deep #273
• Proposed release version: 5.5.9

I have...

• added at least one test to verify the failure condition is fixed.
• verified the tests are passing.

[coveralls]

coverage: 98.077% (+0.02%) from 98.058%
when pulling 32ca8c4 on jose-cabral:nested-arrays-273
into 5869d1b on mrodrig:main.

[mrodrig]

Hi @jose-cabral, thanks for reporting this and the pull request to fix it. This is a great find and I appreciate your work to resolve the underlying issue. I'll work on merging this in and will publish it to NPM in 5.5.9 shortly.