Determining inheritedMetadatas during jest+ts-jest tests collects metadatas that do not belong to the target

[pedroyan]

Creating this discussion because it seems a couple of us are experiencing the problem described here (#1810):

Now, during tests, metadata.target instanceof Function yields false even though it is the class and typeof metadata.target does indeed yield 'function'. I have no idea how this is happening. I'm able to monkey-patch it by using typeof.

@sdokara @mzpeartx - were any of you able to figure out what was going on here?