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require_tld option of validate.URL is missing for fields.URL #749
The validator was implemented in #674. It looks like there was originally some hesitation to add it to the field in #665 and it was closed for backwards compatibility reasons. I don't see any reason why it would be backwards incompatible. It should be safe to add another parameter before the kwargs.
We might be able to add it to v2. We can add it to v3. You will probably need to copy the url field implementation to a custom field with the extra argument supplied for now.