Version mkgmap-r4839 was committed by gerd on Thu, 30 Dec 2021 surrogatePair.patch by Ticker Berkin (slightly modified) "handles UTF16 surrogate pairs so that mkgmap style filters substring and highway-shield give correct results, the LBL trimming leaves the correct amount and neither end up with 1/2 a character. I've looked through all the substring operations and I don't think any others will cause problems. There might just be a few str.length() and str.charAt() or other indexing that might need attention but this would require a lot more searching. I've left the handling for MALFORMED_INPUT so these shouldn't matter." http://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=4839