FilterCertainIntegers for special number values

[ootidea]

ts-array-length/src/typeUtils.ts

Line 17 in 9b0b680

: Str extends "Infinity" | "-Infinity" | "NaN"

Since there are no NaN, Infinity or -Infinity types in TypeScript, I think it would be better to remove them.

Additionally, shouldn't you handle exponential notation decimals as shown below? (For example, 1e-900 is a decimal.)

 : Str extends `${string}e-${string}`

[uhyo]

Thanks! Actually you can produce an Infinity type by type Infinity = 1e1000;. I'm not sure of NaN, but I included one for safety.

The 1e-900 case indeed needs a fix.