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Niels Lohmann
02d57db31e
Two views compared equal when the tokens of two floats were equal, and the same node was equal to itself. An edit writes a NaN as the token "nan", so a view of it (or of an array holding it) was equal to itself and to another NaN, while json(NaN) == json(NaN) and view == json are false. The token shortcut now excludes the edited "nan" token (found by the missing digit layout), dispatched on the document mode by a tag: a read-only document cannot hold a NaN, and its walk is unchanged (instruction count and cycles on canada, citm and twitter within noise). For editable documents the check costs about 2 % instructions on canada (cycles within noise). The same-node shortcut is kept for read-only documents and for editable ones that were never edited; a document with edits is walked, so comparing it with itself is linear instead of constant. Signed-off-by: Niels Lohmann <mail@nlohmann.me>