Should allow ALTER a-bitset a-char

[rebolbot]

Submitted by: Jerry

bc.. so ...

p.

bc.. >> a: charset "A"

ALTER a #"A"

p.

^{CC - Data [ Version: alpha 31 Type: Wish Platform: All Category: Mezzanine Reproduce: Always Fixed-in:alpha 88 ]}

[rebolbot]

Submitted by: BrianH

This is the same request as #422, by the same person on the same day :(