[ox/oc] Resize vectors before writing to them

(synced from 8480eeba0c)

src/ox/oc/read.hpp

@@ -114,6 +114,9 @@ template<typename T>
 Error OrganicClawReader::field(const char *key, T *val) noexcept {
 	auto err = OxError(0);
 	if constexpr(isVector_v<T>) {
+		const auto &srcVal = value(key);
+		const auto srcSize = srcVal.size();
+		val->resize(srcSize);
 		return field(key, val->data(), val->size());
 	} else if (targetValid()) {
 		const auto &jv = value(key);