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* Throw type_error.321 when serializing discarded values to binary formats The CBOR, MessagePack, UBJSON, BJData, and BSON writers silently skipped the payload of a value_t::discarded value nested in an array or object, while still writing its slot in the element/member count (and, for BSON, its entry header), producing a binary document whose declared size does not match what was actually written. Throw type_error.321 instead, for a discarded value anywhere in the tree, including at the top level. Rewritten from the original PR against the current (non-recursive option aside) binary_writer.hpp, which has changed substantially since this was first proposed; the out_of_range.412 MessagePack size check and unrelated test reformatting from that PR are dropped as out of scope here. Signed-off-by: Niels Lohmann <mail@nlohmann.me> * Document and test type_error.321 for discarded binary values Add docs for the new exception (home/exceptions.md and the Exceptions sections of to_cbor/to_msgpack/to_ubjson/to_bjdata/to_bson) and test coverage for a discarded value nested in an array or object, nested deeper, and (for UBJSON/BJData) inside an optimized same-type array, for each of CBOR, MessagePack, UBJSON, BJData, and BSON. Adjust the three pre-existing "discarded" tests that asserted the old silent behavior (empty/short output) to expect type_error.321 instead. Co-authored-by: ameliabarnabyhub <312084480+ameliabarnabyhub@users.noreply.github.com> Signed-off-by: Niels Lohmann <mail@nlohmann.me> --------- Signed-off-by: Niels Lohmann <mail@nlohmann.me> Co-authored-by: ameliabarnabyhub <ameliabarnabyhub@users.noreply.github.com> Co-authored-by: ameliabarnabyhub <312084480+ameliabarnabyhub@users.noreply.github.com>