This is an attempt at a limited-but-lower-overhead Properties object that could be useful for throwaway SDL_PropertiesID...namely, the type we use forSDL_Create*WithProperties functions.

And example of updating testyuv.c to use it:

diff --git a/test/testyuv.c b/test/testyuv.cindex 81ed2b734..93b11f6ef 100644--- a/test/testyuv.c+++ b/test/testyuv.c@@ -619,12 +619,16 @@ int main(int argc, char **argv)      output[0] = SDL_CreateTextureFromSurface(renderer, original);     output[1] = SDL_CreateTextureFromSurface(renderer, converted);-    props = SDL_CreateProperties();-    SDL_SetNumberProperty(props, SDL_PROP_TEXTURE_CREATE_COLORSPACE_NUMBER, yuv_colorspace);-    SDL_SetNumberProperty(props, SDL_PROP_TEXTURE_CREATE_FORMAT_NUMBER, yuv_format);-    SDL_SetNumberProperty(props, SDL_PROP_TEXTURE_CREATE_ACCESS_NUMBER, SDL_TEXTUREACCESS_STREAMING);-    SDL_SetNumberProperty(props, SDL_PROP_TEXTURE_CREATE_WIDTH_NUMBER, original->w);-    SDL_SetNumberProperty(props, SDL_PROP_TEXTURE_CREATE_HEIGHT_NUMBER, original->h);+    {+        const SDL_TemporaryPropertyItem texture_prop_items[] = {+            { SDL_PROP_TEXTURE_CREATE_COLORSPACE_NUMBER, SDL_PROPERTY_TYPE_NUMBER, { .n = yuv_colorspace } },+            { SDL_PROP_TEXTURE_CREATE_FORMAT_NUMBER, SDL_PROPERTY_TYPE_NUMBER, { .n = yuv_format } },+            { SDL_PROP_TEXTURE_CREATE_ACCESS_NUMBER, SDL_PROPERTY_TYPE_NUMBER, { .n = SDL_TEXTUREACCESS_STREAMING } },+            { SDL_PROP_TEXTURE_CREATE_WIDTH_NUMBER, SDL_PROPERTY_TYPE_NUMBER, { .n = original->w } },+            { SDL_PROP_TEXTURE_CREATE_HEIGHT_NUMBER, SDL_PROPERTY_TYPE_NUMBER, { .n = original->h } }+        };+        props = SDL_CreateTemporaryProperties(texture_prop_items, SDL_arraysize(texture_prop_items));+    }     output[2] = SDL_CreateTextureWithProperties(renderer, props);     SDL_DestroyProperties(props);     if (!output[0] || !output[1] || !output[2]) {

If following the rules for these objects (read-only, thread unsafe, etc), they could be used in other situations, as they can be used anywhere an SDL_PropertiesID is expected.

Fixes#14436.