Avoid some allocations with Map.alterF#1219
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Inline the function so that GHC can optimize it based on the altering function. Also unpack the Maybe in TraceResult. Both of these result in less allocations.
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Inline the function so that GHC can optimize it based on the altering function. Also unpack the Maybe in TraceResult. Both of these result in less allocations.
For #1209.