Support for comparison of functions

[mat-hek]

These changes are made under both the "Apache 2.0" and the "GNU Lesser General
Public License 2.1 or later" license terms (dual license).

SPDX-License-Identifier: Apache-2.0 OR LGPL-2.1-or-later

[bettio]

I think it is mostly ok, just a few minor changes:

• Few more tests should be added so we test all cases.
• I suggest moving the function block just after TERM_TYPE_INDEX_REFERENCE block

[bettio]

Let's move this entire block of code between TERM_TYPE_INDEX_REFERENCE and TERM_TYPE_INDEX_PORT, so we follow TermTypeIndex ordering:

[...]
    TERM_TYPE_INDEX_ATOM = 3,
    TERM_TYPE_INDEX_REFERENCE = 4,
    TERM_TYPE_INDEX_FUNCTION = 5,
    TERM_TYPE_INDEX_PORT = 6,
    TERM_TYPE_INDEX_PID = 7,
[...]

[mat-hek]

I moved it just after TERM_TYPE_INDEX_REFERENCE, but the order is not followed for other indices

[bettio]

Awesome, let's rebase & fixup everything into a single commit and it can be merged. I'll do a last CI run in the meanwhile.

[mat-hek]

Squashed into a single commit. BTW, Github supports squash&merge, maybe worth using that instead of squashing manually each time

[bettio]

BTW, Github supports squash&merge, maybe worth using that instead of squashing manually each time

Quite yes, works well unless you sign your commits.

[mat-hek]

eh okay...