Num.div by 0 on Dec should crash, but doesn't

[rtfeldman]

To reproduce, in the repl:

» 1/0

  1000000000000000000 : Frac *

Expected behavior: a crash report on division by zero, like you get for integer divide by zero.

(This can't return something like infinity or NaN because it's a Dec, not a float, and Dec's fixed-point representation is based on integers; it doesn't have an equivalent concept.)

[JRMurr]

Ill give this a shot

[JRMurr]

Looks like there is a difference for this on the local vs web repl

If you run the dev repl locally i see

  The rockin' roc repl
────────────────────────

Enter an expression, or :help, or :q to quit.

» 1/0
thread 'main' panicked at 'not yet implemented: NumDiv: layout, Builtin(Decimal)', crates/compiler/gen_dev/src/generic64/mod.rs:1603:18
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

building the site of off main and using the repl there was the original issue mentioned.

I will work on a fix for both cases EDIT: looks like dec division in the dev generator is not supported entirely at the moment.

Will make sure the wasm generator at least will panic in this case