Hi, Here is a quick draft for more array sizes as discussed last week. http://smalltalkhub.com/#!/~ThibaultRaffaillac/Collections-Arrays It yields (* => new): SByteArray* and ByteArray ShortArray* and UShortArray* IntegerArray and UIntegerArray* LongArray* and ULongArray* SWordArray* and WordArray FloatArray and DoubleArray* I don't know if this is the right way to make a package (also considering the obvious name), anyway here are the unresolved issues: _ ByteArray and WordArray are unsigned, IntegerArray is signed! The package does not rename any though, I go for conservative :p _ Do we have primitives for 8/16/32/64 sreads/ureads/writes? Doing sign extension by hand is painful. _ Same for 32/64 bit IEEE float reads/writes? Current code implicitly transfers float values through integer registers which is SLOW (worse on ARM). _ A big part of the system is hardcoded with assumption (isBytes or isWords), therefore the inspector does not seem to display values&metadata properly. We should probably fix all occurrences of isBytes. Is there a bug filed already? Cheers, Thibault