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prxnvt
0fa6e78863
The xlsx writer drops characters XML 1.0 can't carry: controls other than tab, line feed and carriage return, and U+FFFE and U+FFFF. A stash item holding one lost it on save without a warning, and so did a JSON item, since serde_json leaves U+FFFE and U+FFFF unescaped: a stored macro parameter changed silently. `chunk_formulas` now writes each such character, and the marker itself, as the noncharacter U+FDD0 followed by four hex digits, and `get` turns them back for `_gc_` items. A marker that isn't followed by four hex digits naming a character is read as it is. An escape counts as five units against the 255-unit literal limit and is never split across literals, and the guard on the stored size allows the longest item even when every character is escaped. Legacy `_sc_` items are read unchanged.