Function isNumericString

isNumericString(value: string): boolean
Checks whether a given string represents a valid numeric value.

This function attempts to convert the input string to a number using both Number() and parseFloat(). It returns true only if both conversions do not result in NaN, ensuring that the input is a fully numeric string.

Accepts integers, decimals, scientific notation (e.g. "1e5"), and ignores surrounding whitespace. Does not allow trailing or embedded characters like "123abc" or "abc123".
Parameters
- value: string
  The string to validate.
Returns boolean
- true if the string represents a valid number; otherwise, false.
Example
```
isNumericString("42"); // true
isNumericString("-3.14"); // true
isNumericString("1e5"); // true
isNumericString("  123 "); // true
isNumericString("123abc"); // false
isNumericString("abc123"); // false
```
See also:
- Defined in src/string/validate.ts:160