Fix dumping StringIO
(and potentially others) on Ruby <= 2.7
#729
+15
−1
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In Ruby < 3.0, the superclass of StringIO was actually already
Data
, but it doesn't have the expected shape. So, on these earlier versions it errors:This test doesn't fail on 2.7, presumably because it can pull in a newer
stringio
version.Some context: https://bugs.ruby-lang.org/issues/3072
Here's a test failure before the fix: https://github.com/Earlopain/psych/actions/runs/14976611657/job/42070451324