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edd7eb9ebb
Previously, we'd use a lossy conversion that would replace funky sequences with the unicode replacement character. This commit will instead print the bad bytes as hex-escaped characters. This can be useful when troubleshooting things in tests; this commit also turns up info logging for the lua test runner so that we can see that, although nothing else in this commit actually calls that. I did use it while troubleshooting things just now though, so it is generally useful.