SC3016 and SC3017 are not issued for test ! -a and test ! -v, respectively

[e-kwsm]

For bugs

• Rule Id (if any, e.g. SC1000): SC3016 and SC3017
• My shellcheck version (shellcheck --version or 'online'): online
• I tried on shellcheck.net and verified that this is still a problem on the latest commit
• It's not reproducible on shellcheck.net, but I think that's because it's an OS, configuration or encoding issue

For new checks and feature suggestions

• shellcheck.net (i.e. the latest commit) currently gives no useful warnings about this
• I searched through https://github.com/koalaman/shellcheck/issues and didn't find anything related

Here's a snippet or screenshot that shows the problem:

#!/bin/sh
test ! -a /bin/sh
[ ! -a /bin/sh ]
test ! -v SHELL
[ ! -v SHELL ]

Here's what shellcheck currently says:

Line 3	SC3017: In POSIX sh, unary -a in place of -e is undefined.
Line 5	SC3016: In POSIX sh, unary -v (in place of [ -n "${var+x}" ]) is undefined.

Here's what I wanted or expected to see:

Line 2	SC3017: In POSIX sh, unary -a in place of -e is undefined.
Line 3	SC3017: In POSIX sh, unary -a in place of -e is undefined.
Line 4	SC3016: In POSIX sh, unary -v (in place of [ -n "${var+x}" ]) is undefined.
Line 5	SC3016: In POSIX sh, unary -v (in place of [ -n "${var+x}" ]) is undefined.