Initial prototype fix for issue #2651

[ddurschlag]

Uses a non-arrow function to maintain this.

Closes #2651

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[ddurschlag]

Known problems:

1. Only applies to sync functions (easy fix, just haven't done it)
2. Not clear if there's a performance impact
3. Not clear if this is better than a proxy-based approach
4. Involves this-aliasing that eslint does not approve of
5. Test might be considered anemic? Not sure if I should be adding other tests.

Would love maintainer opinions or code suggestions on any of the above.