Fix to pseudorandom number generator

random/random.py

@@ -8,13 +8,13 @@
 # successive calls to rando() will produce the required result.
 # Timing 109us (Pyboard 1.1), 191us (Pyboard lite), 1.264ms (ESP8266)
 
+
 def xorshift64star(modulo, seed = 0xf9ac6ba4):
     x = seed
     def func():
         nonlocal x
         x ^= x >> 12
-        x ^= x << 25
+        x ^= ((x << 25) & 0xffffffffffffffff)  # modulo 2**64
         x ^= x >> 27
-        x &= 0xffffffffffffffff
         return (x * 0x2545F4914F6CDD1D) % modulo
     return func