3.26.2

Fixed issues

• Fixed fn:random-number-generator?permute to work like the spec describes it
• Make fn:serialize output a single string instead of an array

Other improvements

• Simplify types in postFixExprWithStep, thanks to @HectorPeeters
• Add type annotations for single item sequences, again thanks to @HectorPeeters
• Remove slimdom-sax-parser from the dependencies, use the built-in parser from slimdom instead