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I thought Puck had 512 KB of storage and 64KB of RAM. But you said "reduce it from 40 to 32KB."
out of 512 you only have 10 4kb pages for storage of your code
https://github.com/espruino/Espruino/blob/master/boards/PUCKJS.py#L78instead of Raspberry Pi zero
or Raspberry Pico W
it is whole filesystem module - file IO methods + FAT filesystem implementation
and it is not RAM