[bug #68091] Inefficient Integer Data Loading from MAT-Files

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Follow-up Comment #3, bug #68091 (group octave):

Thought about it some more, I think the temp buffer is to handle swapping and
type promotion. MAT-files perform compression of numeric data if theres no
data loss (e.g. if array is actually double but contains numeric values it
could be written as integer type). I believe we can avoid the temp buffer if
there's no compression and no swap. Might be good to run it by JWE once



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