checkFile error on non-existent file

A call to File.checkFile() on a non-existent file results in a callback error with code NOT_FOUND_ERR.

The function specification of checkFile() says:

"Returns a Promise that resolves with a boolean or rejects with an error."

Even if it is not further clarified in the specification, is almost intuitive expecting that it should return a Promise "false" if the file doesn't exist, instead of resulting in the NOT_FOUND_ERR.