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This addresses part of #93, reducing the MPSC padding so that the data structure fits in 192 bytes leaving enough space for it to be used intrusively in memory pool allocated data structure like pledges.
Unfortunately the {.align.} pragma for generics is actually not applied so MPSC Channel is not padded.
This means that currently cache conflicts between threads are high and performance will be increased (especially on the steal requests overhead front), but it may also cause size issues in the future.
See upstream: nim-lang/Nim#13122