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A non contiguous Vec that optionally holds a value for a given index.
It is called a LowMap because it maps a given index to a value, and this
index must be small as it will be used as the inner Vec index.
A non contiguous Vec that optionally holds a value for a given index.
It is called a LowMap because it maps a given index to a value, and this
index must be small as it will be used as the inner Vec index.