Bugfix: TypedSymbol.is_negative should not be implemented in terms of

super().is_positive

This can lead to surprising simplifications
6 jobs for bug-is-negative in 4 minutes and 54 seconds (queued for 29 seconds)
Status Job ID Name Coverage
  Test
passed #289578
cuda docker
build-documentation

00:00:51

passed #289577
cuda docker
flake8-lint

00:00:18

passed #289576
docker
minimal-conda

00:00:26

passed #289575
docker
minimal-ubuntu

00:00:24

passed #289574
win
minimal-windows

00:01:49

passed #289573
AVX cuda docker
tests-and-coverage

00:03:21