tomhughes left a comment (openstreetmap/openstreetmap-website#6350)
The TAG SPACE characters may well behave weirdly in Java because they're
outside the BMP so while they are one codepoint they will need to be encoded as
a surrogate pair in the UTF-16 encoding that Java uses so there will be two
UTF-16 values for each one which would add an extra four to the length.
You probably want to use `String.codePointCount` instead of the normal length
function.
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