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Fix borsh map deserialization for variable length layouts #3551

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@kiwec kiwec commented Feb 11, 2025

MapEntryLayout's constructor wrongly assumed key/value layouts have a fixed size, and getSpan() computed the length of map entry values at the wrong offset.

getSpan() was computing value size from the wrong offset.
The constructor also caused wrong calculations when only one of the
layouts has a variable size.
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