[01:22] <japhb> Something from earlier this week ... Unicode properties that have a limited number of possible values (bits, enumerants, numeric values, etc.) have special mappings that attempt to bit-pack the field values to save in-memory space.  As I recall there were various heuristics to make the mappings tighter than even that description would give, and to reduce the number of fields that crossed memory word 

[01:22] <japhb> boundaries for runtime efficiency.

[01:23] <japhb> When I was hacking on ucd2c.pl, I added some more detailed debugging output for that, but it still requires some thought to make sense of it.

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