in native/src/meld_keys/key_trait.rs [37:43]
fn build_meld_key(&self, work_asset: &WorkAsset) -> Result<MeldKey> {
Ok(format!(
"[sampler={},source={}]",
key_or_empty(work_asset.sampler_keys(), self.sampler),
key(work_asset.image_keys(), self.source),
))
}