style: compact inner groups and simple guard bodies

std/strconv/strconv.hon

@@ -58,9 +58,7 @@ parse_float proc(allocator mem.Allocator, text []u8) f64 ! (mem.AllocError | Par
         magnitude >= u64(9218868437227405312)
         or (magnitude == 0 and nonzero)
         or (range_error and magnitude >= u64(4607182418800017408))
-    ) {
-        return .out_of_range
-    }
+    ) return .out_of_range
     return value
 }