Reduce memory usage during map creation

Right now, we pre-process all of the map data in memory while writing the map out to disk. The primary offender is

Line 433 in 5be40dd

def process_args_and_kwargs(args_and_kwargs: Iterator[Tuple[tuple, dict]]):

, but the ease of using the pre-processed data has downstream effects elsewhere.

Hopefully, we can completely remove the need for pre-processing. This would dramatically reduce memory usage during map creation.

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