See http://www.ruby-doc.org/core-1.9.3/String.html#method-i-3C-3C
Apparently, String#<< uses Integer#chr, not Integer#to_s. News to me.
Fixed originally by @TsCl in PR #2435, but fixing seperately in order to
avoid screwing up his downstream tracking. Note, this isn't a merge, so
using Closes tag on the commit message.
[Closes#2435]
Tod Beardsley
9ada96ac51