Time.rfc3339's pattern used [T\s], so it accepted a tab, newline,
vertical tab, form feed or carriage return between the date and the
time. Time.xmlschema's pattern has a bare T.
RFC 3339 section 5.6 defines the separator as "T" and only notes that an
application may use a space for readability. The other \s characters are
not permitted by either.
Since Ruby 3.2 the pattern also disagrees with what the code does with
the string it matched. _xmlschema hands it to Time.new, which rejects
those five characters, so the documented ArgumentError never gets raised
and Time.new's internal message escapes instead:
Time.rfc3339("2011-10-05\t22:26:12Z")
#=> ArgumentError: "+HH:MM", "-HH:MM", "UTC" or "A".."I","K".."Z"
# expected for utc_offset: 22:26:12Z
Narrowing the class to [T ] makes the pattern agree with the RFC, with
Time.xmlschema, and with what _xmlschema can actually parse, so these
inputs now raise "invalid rfc3339 format:" as documented.
https://github.com/ruby/time/commit/03c5cc82d1
youdie006
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