| http://www.w3.org/ns/prov#value | - What they really mean is the index of the first code point comprising the grapheme the user clicked, inside the UTF8-encoded string that you passed in when creating the layout.This works well in languages such as C and Ruby 1.8 where a string is just an array of UTF8-encoded bytes, but in Factor, strings are an abstract sequence of Unicode code points with the actual internal encoding hidden from
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