v0.1.1 decode hardening, round trip support, doc and test update

decode_fsm_test.go

@@ -308,7 +308,7 @@ transitions = [
 		t.Error("GuardArgs is nil")
 	} else if ms, ok := grw.Transitions[0].GuardArgs["ms"]; !ok {
 		t.Error("GuardArgs missing 'ms' key")
-	} else if msInt, ok := ms.(int); !ok || msInt != 2000 {
+	} else if msInt, ok := ms.(int64); !ok || msInt != 2000 {
 		t.Errorf("GuardArgs.ms mismatch: %T %v", ms, ms)
 	}
 }
@@ -841,4 +841,4 @@ binary_val = 0b1010
 	if cfg.Edge.Cases.BinaryVal != 0b1010 {
 		t.Errorf("BinaryVal = %d, want %d", cfg.Edge.Cases.BinaryVal, 0b1010)
 	}
-}
+}