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This is only new data allocated, so it's a very careful procedure.
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A negative number under 2s complement can never be equal to its
positive as the top bit *must* be on. If two numbers are equivalent
bit-by-bit then they are equal for both signed and unsigned numbers.
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Anything other than char (which can just use print.byte to print the
hex) and byte (which prints hexes anyway), all other types may be
forced to print a hex rather than a number if PRINT_HEX is 1.
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These new members are just signed versions of the previous members.
This makes type punning and usage for signed versions easier than
before (no need for memcpy).
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For each type T there is the signed version s_T
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As it has no dependencies on vm specifically, and it's more necessary
for any vendors who wish to target the virtual machine, it makes more
sense for inst to be a lib module rather than a vm module.
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Prints useful and pretty messages when verbose being at least 1.
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Default C just lets overflows occur for subtraction, so this macro
will default to 0 if the subtraction causes an overflow.
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Doesn't make sense for them to be in the VM module when they have a
more general purpose now.
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If an empty file is read, we want to deal with it in later user code
rather than just failing immediately.
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