Branch coverage of the test suite and of 24k mutated inputs showed
these conditions as never taken; each is implied by the code around it:
- copy_object_level(): `src_it != src_object.cend()`; dst was built from
exactly src_object.size() unique keys and src_it advances at most once
per member
- the general comparison operators (equal_general, less_general,
three_way_general): the five same-type scalar cases, which the inline
fast path of every operator handles before calling them (now an
assert); and the NaN half of compares_unordered() in the mixed-type
branch, reached only after all six number pairs returned, where only
a discarded operand is unordered
- serializer, ensure_ascii: the reset of `bytes` under error_handler_t::keep
and the surrogate-pair escape in the UTF8_ACCEPT case; every
well-formed multi-byte character is escaped by write_u_escapes() before
decode() sees it, so decode() only ever accepts DEL here, a single byte
of which nothing was buffered (now asserts)
- iter_impl(pointer): the if/else chain assigned value-initialized
iterators to the value-initialized m_it
No change in behaviour: a build that aborts on each removed side passes
the test suite, the fuzz corpora and 23.2M dumps of all 1-, 2- and
boundary 4-byte strings in both ensure_ascii modes.
Signed-off-by: Niels Lohmann <mail@nlohmann.me>
Niels Lohmann
2ac0851157