PR #269GH #268 Recognize blessed glob handles (e.g. IO::String) in Expat::parse. The input-detection logic already handled IO::Handle subclasses, unblessed GLOB refs, bare globs, and bareword filehandle names but missed blessed globs that don't inherit from IO::Handle (such as IO::String), silently stringifying them and feeding the stringification to ParseString. Add a Scalar::Util::reftype check so blessed GLOB references are treated like any other glob handle
Maintenance:
Add IO::String to the cpanfile so CI exercises the blessed-glob-handle code path covered by PR #269