fix(parse): handle promises returned from parsed function calls

[jussik]

When a parsed function call returns a promise, the evaluated value
is the resolved value of the promise rather than the promise object.

Closes #3503

[mary-poppins]

Thanks for the PR!

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Thanks again for your help!

[jussik]

Real name: Jussi Kosunen

[vojtajina]

Merged as 3a65822. Thank you @jussik !