=> R0 = 4
R4 = current size of area (bytes)
R5 = page size (bytes)
R12 = workspace pointer passed to OS_DynamicArea 0 or base of area.
<= r3 = maximum amount area could shrink by, in bytes
Controls how much of the area's current size may be regarded as free by the kernel, and reclaimed if necessary via a normal shrink.
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