Another renumbering, so that all concurrent styles are bundled together

19-constructivist/README.md

@@ -0,0 +1,20 @@
+Style #21
+==============================
+
+Constraints:
+
+- Every single procedure and function checks the sanity of its
+  arguments and either returns something sensible when the arguments
+  are unreasonable or assigns them reasonable values
+
+- All code blocks check for possible errors and escape the block
+  when things go wrong, setting the state to something reasonable
+
+Possible names:
+
+- Constructive
+- Defensive
+- Hopeful
+- Shit happens, life goes on
+
+(See http://en.wikipedia.org/wiki/Constructivism_(mathematics))