Address review of #5970:
- build() takes validate_only as an argument; the validate_only members of
document_data and basic_json_document are removed, so neither grows
- the internal read path takes an on_error mode (discard, raise, validate)
instead of allow_exceptions; accept() calls it with on_error::validate
- build_with() has no default for Store
- drop the unneeded static_casts in push_node()
- name the NulIsEnd argument so astyle keeps build<...> intact
- explain in the docs and code why comments/trailing commas keep the index
Signed-off-by: Niels Lohmann <mail@nlohmann.me>
Niels Lohmann
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