Class-A surfacing 2/3: surface match, boundary patch and CV fairing (#1487)

Thanks @midasdf.

crates/doc/src/walk.rs

@@ -40,6 +40,8 @@ impl Walk for bool {}
 impl Walk for u64 {}
 impl Walk for i8 {}
 impl Walk for f64 {}
+impl Walk for usize {}
+impl Walk for u32 {}
 impl Walk for ProfileSel {}
 impl Walk for solidcraft_sketch::Sketch {}
 impl Walk for solidcraft_sketch::PatternAlignment {}