Enhance randomNumber() function

[tfmorris]

The randomNumber() function currently takes two Number arguments, converts them to integers and returns a random number in the open interval.

Proposed solution

I think the following changes would improve the function:

• shorten the name to just random()
• create a 0-arg version which returns a Double in the interval 0.0 - 1.0
• provide two alternatives for the 2-arg version which return either an Long or a Double, depending on type of the parameters which are passed in

Alternatives considered

• the 2-arg integer version could have a different name like randint a la Python
• a variant that accepts a seed value could be useful for those who want reproducible results

[SustechcsKing]

Hi, sir, I just add a function, you can check it in #3845 . First, it generates a random number by random(). Second, it can generate a random Long or random double by argument, but it still needs the typecasting when getting the number, because its return type is Object. I think this may meet your standard. Thank you.

[elroykanye]

@wetneb , I noticed this was taken but not completed and pr closed. Please can I take and work on it?