[fpc-pascal] type conversions

[memsom at interalpha.co.uk]

> No, a type conversion between ordinal types does not change one bit 
> pattern into another. -1 is a bit pattern that only contains 1-bits, so 
> when you convert that to an unsigned type, it still contains only 
> 1-bits and as such becomes the highest value that that unsigned type 
> can represent (65535 in case of an unsigned 16 variable).

Whatever the truth, how else does the 'list index out of bounds (0)' happen?

Matt

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