builtins: add frq xs for frequency maps with type-prefixed keys#210
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Counting occurrences is one of the most common aggregations agents do (word counts, label tallies, histogram bucketing). Doing it manually needs a fold with map lookups and writes, which is verbose. frq xs returns M t n keyed by element with type-prefix encoding so n and s elements with the same printed form don't collide. Opcode 140 across tree, vm, cranelift.
danieljohnmorris
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Counting occurrences is one of the most common aggregations (word counts, label tallies, histograms). Doing it manually needs a verbose fold with map lookups.
Implementation:
Tests: 15 cross-engine regression tests + examples/frq.ilo with -- run: directives.