1e100000000000000 generates internal error

[schanzer]

Came up in PD today

[asolove]

This is kinda interesting.

• The provided example, 1e100000000000000, immediately throws a stack overflow.
• Much smaller examples, like 1e1000, simply evaluate, though progressively slower, as you would expect.
• But inbetween examples, like 1e1000000, simply keep running, not throwing an error but taking up all the CPU so that nothing else can run in that tab:

[sorawee]

This is a duplicate of https://github.com/brownplt/pyret-lang/issues/1479, FWIW.