* Improve error message for const fields * Reject const arguments to get_to() with a clear message Reword the static_assert, add it to the C array overload of get_to() as well, and document that v must not be const. Signed-off-by: Niels Lohmann <mail@nlohmann.me> --------- Signed-off-by: Niels Lohmann <mail@nlohmann.me> Co-authored-by: Niels Lohmann <mail@nlohmann.me>