increased store for random seeds to 64k

docs/scarpet/language/SystemFunctions.md

@@ -227,11 +227,12 @@ length('foo') => 3
 ### `rand(expr), rand(expr, seed)`
 
 returns a random number from `0.0` (inclusive) to `expr` (exclusive). In boolean context (in conditions, 
-boolean functions, or `bool`), returns false if the randomly selected value is less than 1\. This means 
-that `rand(2)` returns true half of the time and `rand(5)` returns true for 80% (4/5) of the time. If seed is not 
-provided, uses a random seed. If seed is provided, each consecutive call to rand() will act like 'next' call to the 
-same random object. Scarpet keeps track of up to 1024 custom random number generators, so if you exceed this number 
-(per app), then your random sequence will revert to the beginning.
+boolean functions, or `bool`), returns false if the randomly selected value is less than 1. This means 
+that `bool(rand(2))` returns true half of the time and `!rand(5)` returns true for 20% (1/5) of the time. If seed is not 
+provided, uses a random seed that's shared across all scarpet apps. 
+If seed is provided, each consecutive call to rand() will act like 'next' call to the 
+same random object. Scarpet keeps track of up to 65536 custom random number generators (custom seeds, per app), 
+so if you exceed this number, your random sequences will revert to the beginning and start over.
 
 <pre>
 map(range(10), floor(rand(10))) => [5, 8, 0, 6, 9, 3, 9, 9, 1, 8]