PhpDocParser: support template type lower bounds #254
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I'd like to take a shot at template type lower bounds (phpstan/phpstan#5179). This PR adds support for parsing lower bounds.
As I've reasoned in phpstan/phpstan#5179 (comment): while I don't think it's particularly useful, the implementation that I envision in phpstan/phpstan-src will be able to account for a template having both bounds, regardless of whether it's allowed in the parser or not. Thus, I don't see any technical reason not to allow it.