add PartialEq for LazyLoadBlob, refactor into its own file

src/lazy_load_blob.rs

@@ -0,0 +1,16 @@
+pub use crate::LazyLoadBlob;
+
+impl std::default::Default for LazyLoadBlob {
+    fn default() -> Self {
+        LazyLoadBlob {
+            mime: None,
+            bytes: Vec::new(),
+        }
+    }
+}
+
+impl std::cmp::PartialEq for LazyLoadBlob {
+    fn eq(&self, other: &Self) -> bool {
+        self.mime == other.mime && self.bytes == other.bytes
+    }
+}

src/lib.rs

@@ -60,6 +60,8 @@ mod on_exit;
 pub use on_exit::OnExit;
 mod capability;
 pub use capability::Capability;
+mod lazy_load_blob;
+pub use lazy_load_blob::LazyLoadBlob;
 
 /// Implement the wit-bindgen specific code that the kernel uses to hook into
 /// a process. Write an `init(our: Address)` function and call it with this.
@@ -134,15 +136,6 @@ pub fn spawn(
     )
 }
 
-impl std::default::Default for LazyLoadBlob {
-    fn default() -> Self {
-        LazyLoadBlob {
-            mime: None,
-            bytes: Vec::new(),
-        }
-    }
-}
-
 /// Create a blob with no MIME type and a generic type, plus a serializer
 /// function that turns that type into bytes.
 ///