Fix a feature Predictable results in nanoid generation when given non-integer values

[kreeksec]

When nanoid is called with a fractional value, there were a number of undesirable effects:

• in browser and non-secure, the code infinite loops on while (size--)
• in node, the value of poolOffset becomes fractional, causing calls to nanoid to return zeroes until the pool is next filled
• if the first call in node is a fractional argument, the initial buffer allocation fails with an error

CVE-2024-55565
CWE-835

[aduth]

Thanks for your pull request! We decided to resolve this a different way in #11722. I have credited you as co-author of the commit in that pull request to acknowledge your contribution.

Thanks again.