tests/float: Add tests for hashing float and complex numbers.

tests/float/builtin_float_hash.py

+# test builtin hash function with float args
+
+# these should hash to an integer with a specific value
+for val in (
+    '0.0',
+    '1.0',
+    '2.0',
+    '-12.0',
+    '12345.0',
+    ):
+    print(val, hash(float(val)))
+
+# just check that these values are hashable
+for val in (
+    '0.1',
+    '-0.1',
+    '10.3',
+    'inf',
+    '-inf',
+    'nan',
+    ):
+    print(val, type(hash(float(val))))

tests/float/complex1.py

@@ -41,6 +41,10 @@ print(1j == 1j)
 print(abs(1j))
 print("%.5g" % abs(1j + 2))
 
+# builtin hash
+print(hash(1 + 0j))
+print(type(hash(1j)))
+
 # float on lhs should delegate to complex
 print(1.2 + 3j)