{{alias}}()
    Returns the effective numeric user identity of the calling process.

    The function only returns an effective user identity on POSIX platforms. For
    all other platforms (e.g., Windows and Android), the function returns
    `null`.

    Returns
    -------
    id: integer|null
        Effective numeric user identity.

    Examples
    --------
    > var uid = {{alias}}()

    See Also
    --------