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Niels LohmannandGitHub
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operator>>'s notes state that it leaves the stream positioned right after the parsed value, so that concatenated JSON values can be read back to back. That does not hold when the value is a number: a number is only terminated by the character that follows it, and the lexer's unget() is simulated (it rewinds only the lexer's own bookkeeping), so that character stays consumed from the stream. Document the actual behaviour: the guarantee holds for all value types except numbers, which must be followed by whitespace. Also qualify the cross-reference on the JSON Lines page, which repeated the unqualified claim. Documentation only; the behaviour itself is tracked in #5340. Signed-off-by: Niels Lohmann <mail@nlohmann.me>
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