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b98aef8a07
to_bjdata() encoded a JData-annotated object as a BJData ND-array in two cases where from_bjdata() then returned a different value, breaking the documented round-trip guarantee: 1. A "single" element that is finite and in range but not exactly representable as float (e.g. 0.1) or that underflows to 0 (e.g. 1e-300) was silently narrowed instead of falling back to a plain object, unlike out-of-range integer elements. write_bjdata_ndarray() now only accepts a "single" element if it survives the narrowing to float and back, the same criterion write_compact_float() already uses for CBOR/MessagePack. 2. from_bjdata() emitted the annotation keys as _ArraySize_, _ArrayType_, _ArrayData_ instead of the documented _ArrayType_, _ArraySize_, _ArrayData_, because the size key is written while the dimension vector is read, before the type key. For ordered_json, whose comparison takes key order into account, this made a round trip of the documented example compare unequal. The element type marker is known before the dimension vector is read (it precedes '#'), so it is now passed down and the "_ArrayType_" key is emitted first. Fixes #5661. Signed-off-by: Niels Lohmann <mail@nlohmann.me>