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Go unicode.RangeTables maps are fast/safe for concurrent reads

This surprised me (as did discovering map reads are always safe for concurrency despite the sketchy language¹). The entire unicode package uses simple Go maps, which are very fast.

// Categories is the set of Unicode category tables.
var Categories = map[string]*RangeTable{
  "C":  C,
  "Cc": Cc,
  "Cf": Cf,
}

1. Go maps are safe for concurrent reads (as best we can tell) ↩

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