Fix loading of binary resources with 64-bit floats

core/io/resource_format_binary.cpp

@@ -901,6 +901,7 @@ void ResourceLoaderBinary::open(FileAccess *p_f, bool p_no_resources, bool p_kee
 	if (flags & ResourceFormatSaverBinaryInstance::FORMAT_FLAG_UIDS) {
 		using_uids = true;
 	}
+	f->real_is_double = (flags & ResourceFormatSaverBinaryInstance::FORMAT_FLAG_REAL_T_IS_DOUBLE) != 0;
 
 	if (using_uids) {
 		uid = f->get_64();
@@ -1902,7 +1903,13 @@ Error ResourceFormatSaverBinaryInstance::save(const String &p_path, const RES &p
 
 	save_unicode_string(f, p_resource->get_class());
 	f->store_64(0); //offset to import metadata
-	f->store_32(FORMAT_FLAG_NAMED_SCENE_IDS | FORMAT_FLAG_UIDS);
+	{
+		uint32_t format_flags = FORMAT_FLAG_NAMED_SCENE_IDS | FORMAT_FLAG_UIDS;
+#ifdef REAL_T_IS_DOUBLE
+		format_flags |= FORMAT_FLAG_REAL_T_IS_DOUBLE;
+#endif
+		f->store_32(format_flags);
+	}
 	ResourceUID::ID uid = ResourceSaver::get_resource_id_for_path(p_path, true);
 	f->store_64(uid);
 	for (int i = 0; i < ResourceFormatSaverBinaryInstance::RESERVED_FIELDS; i++) {

core/io/resource_format_binary.h

@@ -164,6 +164,8 @@ public:
 	enum {
 		FORMAT_FLAG_NAMED_SCENE_IDS = 1,
 		FORMAT_FLAG_UIDS = 2,
+		FORMAT_FLAG_REAL_T_IS_DOUBLE = 4,
+
 		// Amount of reserved 32-bit fields in resource header
 		RESERVED_FIELDS = 11
 	};