Originally Posted by mahasamatman

Any non-whitespace character is valid in a URL, so that argument doesn't hold water. The auto-parser works with URLs followed by most other punctuation (periods, commas, exclamation points), which are all not only definitely valid, but very common in URLs. Since the 99.9999% use case for a right parenthesis is to set off a URL, the 0.0001% case of actually wanting to include one in a URL should be the one that people have to handle specially.