Your polyfill deviates from standard behavior regarding sparse Arrays. Compare
[1,,3].map(console.log) // only logs existing items [1,,3].myMap(console.log) // also logs the empty item
Use for..in and check for hasOwnProperty to rectify that issue.
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Your polyfill deviates from standard behavior regarding sparse Arrays. Compare
Use for..in and check for hasOwnProperty to rectify that issue.