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Validation returns true with max metadata

Steps to reproduce

parsePhoneNumberFromString('+420721234876abc').isValid()

Observed result

Returns true.

Expected result

Returns false due to the invalid suffix, demo page returns true, but Google demo page detects invalid state.

Google's demo link

https://libphonenumber.appspot.com/phonenumberparser?number=%2B420721234876abc&country=CZ&geocodingLocale=cs