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fix(metadata): don't rely on `instanceof` checks

The testing framework Jest creates a new V8 VM for each test file
and as a result, it's not possible to rely on `instanceof Function`
checks to work - there may be multiple `Function` constructors
present.

This commit reworks `instanceof Function` check to use `typeof` instead.

Signed-off-by: Miroslav Bajtoš <mbajtoss@gmail.com>

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