Re-allow users to not select an emulator UI port. #8626
Merged
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Fixes #8621
Sorry; somehow I missed that there was a case where numbers are not required. Keeps the library's behavior of assuming that numbers are required, but allows explicitly overwriting this with a "reququired: false". This is the only value that can be provided to "required". Using type magic, the return type of number can only be defined if "required: false" is passed in.
Verified manually.