"%2s" does not add left-padding when given a unicode character

[postmodern]

It appears that when formatting a unicode characters within a %2s format string, the raw byte length of the unicode String is used instead of the character length.

Expected Behavior

("%2s" % "☃").length
# => 2

Actual Behavior

("%2s" % "☃").length
# => 1

Version Info

$ truffleruby -v
truffleruby 21.2.0.1, like ruby 2.7.3, GraalVM CE Native [x86_64-linux]

[eregon]

@aardvark179 Could you take a look at this one? (can be after the rb_sprintf changes)

[aardvark179]

This was actually fixed as part of the rb_sprintf work I believe. It certainly appears to be producing the correct results now.