Better heuristics of the coverage by a font of a human script sound useful, but 
don’t the standards discourage using codepoint blocks for determining whether a 
character belongs to the repertoire of a human language or script? Although the 
specification authors try to arrange characters into codepoint blocks as 
logically as they can, codepoint blocks are, most of all, artifacts of 
Unicode’s own patchwork history. Additional information, such as script 
information or ICU data, is often required to correctly determine a script’s 
repertoire of essential characters. See also and

Another thing to point out is that correct rendering of script-essential 
combined characters is another important part of font quality. This would be 
difficult to evaluate only with a heuristic based on codepoint blocks. 

J. S. Choi
Saint Louis University
School of Medicine 

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