Type Integer does not support signed comparisons

[WeeknightMVP]

$ docker run --rm -it ghcr.io/galoisinc/cryptol:nightly
┏━╸┏━┓╻ ╻┏━┓╺┳╸┏━┓╻
┃  ┣┳┛┗┳┛┣━┛ ┃ ┃ ┃┃
┗━╸╹┗╸ ╹ ╹   ╹ ┗━┛┗━╸
version 2.13.0.99
https://cryptol.net  :? for help

Loading module Cryptol
Cryptol> (-3:Integer) <$ 5

[error] at <interactive>:1:1--1:18:
  • Type `Integer` does not support signed comparisons.
      arising from
      use of expression (<$)
      at <interactive>:1:1--1:18

Should it?

[WeeknightMVP]

> :h <$

    (<$) : {a} (SignedCmp a) => a -> a -> Bit

Precedence 30, does not associate.

2's complement signed less-than.

Integers are not "2's complement".

Cryptol> :h <

type constraint i < j = j >= 1 + i

Assert that the first numeric type is less than the second.

            ---------

    (<) : {a} (Cmp a) => a -> a -> Bit

Precedence 30, does not associate.

Less-than. Only works on comparable arguments.

Bitvectors are compared using unsigned arithmetic.

Integers are not bitvectors, so comparison is not "unsigned" and the type constraint applies. Makes sense.