PHPDoc: use union of literals for $method parameter throughout #1487
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Replaces
@param string $method
with the more specific@param 'delete'|'get'|'post' $method
.This is possibly a little stricter than necessary as CurlClient does
\strtolower
, but I think it's best to standardize on lower case.This does mean that users using psalm/phpstan/etc. on a sufficiently strict setting will get new type errors when they upgrade, but that's in line with our policy that even "breaking" PHPDoc changes can happen in minor versions.