complex number support

[IchorDev]

On Wednesday, 4 February 2026 at 17:59:19 UTC, Walter Bright 
wrote:
> Complex will always have to be supported because of C.

On Wednesday, 4 February 2026 at 17:53:49 UTC, Walter Bright 
wrote:
> ucent and float16 are a much simpler problem.

Then why can't we have `cent`/`ucent`? The library 
implementations don't have unsigned Int128 and have inconvenient 
semantics.