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Tim Kientzle e75a8c03e7 Fix parsing issues on 32-bit hosts

These were mostly bugs with code of the following form:
```
  if uint64Value < (... literal expression ...)
```
Swift's comparison operators allow their left- and right-hand sides to be of
different widths.  This in turn means that the literal expression above
typically gets typechecked by default as a plain `Int` or `UInt` expression.
In a number of cases, this led to truncation on platforms where `Int` is
not 64 bits.

In particular, this seems to fix tests on wasm32.

2025-12-12 07:16:59 -08:00