Yes, numeric types are compiled to JavaScript numbers, which are represented on 8 bytes. Are you running into overflow/underflow issues?
Yes, in a hashing operation my F# code uses the fact that in standard F# int32 operations are unchecked. I created already a workaround. But it would really be nice to have these differences documented somewhere.
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I am still debugging code that I ported to Websharper client side, and coming across inconsistencies between F# and Websharper. I just found (I think) that Int32 compiles to 64-bit integers. Is that correct?