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The old code was exceedingly simple, as it went char-by-char and decided whether to write it to the output stream as-is, or escaped. This caused a _lot_ of stream writes of individual characters. The new code instead looks for characters that need escaping, and bulk-writes the non-escaped characters in between them. This leads to about the same performance for strings that comprise of only escaped characters, and 3-10x improvement for strings without any escaping needed. In practice, we should expect the former rather than the latter, but this is still nice improvement.