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optimise writing the map file

Dan Villiom Podlaski Christiansen requested to merge topic/default/faster-map-write into branch/default

We currently write the map file to an io.BytesIO buffer, and then write it to an atomic temporary file. However, the file is opened for atomic write, so the extra buffering doesn't really add anything other than overhead.

Edited by Dan Villiom Podlaski Christiansen

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