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Unit tests are in the new file utils/unit_tests.ml, and are run by the new test
file tests/value/unit_tests.i through the exported function Eva.Unit_tests.test.

Resolve "[wp] incorrect sorting for float builtins"

Closes #898

See merge request frama-c/frama-c!2738

[Eva] Do not fail on comparisons involving wide strings

See merge request frama-c/frama-c!2735

Comparison alarms are emitted for any comparison involving wide strings.

Removes function [iter_on_strings] from Locations.Location_Bytes.
Do not fail on comparison of wide strings: just returns false, thus leading to
an alarm in all cases.

[typing] always push current pack status on pragma pack push directives

Closes #897

See merge request frama-c/frama-c!2737

Even if we don't know what to do with the argument of the push, this at least
ensures that push/pop directives stay well parenthesized.

[Dev] add ppx_deriving_yojson to reference configuration; sort and update list

See merge request frama-c/frama-c!2730

status of loop assigns in presence of multiple emitter

See merge request frama-c/frama-c!2725

similar semantics as the parameter of same name in
`add_assigns` and `add_allocates` in contracts

i.e. they will present at most one AAssigns and AAllocates per set of behaviors.

Fix/andre/more changelog fixes

See merge request frama-c/frama-c!2727