The `int()` function converts the given value into a signed integer
value and returns the resulting number.

Returns `NaN` if the given argument is not convertible into a number.

Returns `NaN` if the conversion result is out of range.

-- Testcase --
{%
	printf("%.J\n", [
		int(),
		int(false),
		int(123),
		int(456.789),
		int(""),
		int("invalid"),
		int("deaf"),
		int("0x1000"),
		int("0xffffffffffffffff"),
		int("0177"),
		int("+145"),
		int("-96")
	]);
%}
-- End --

-- Expect stdout --
[
	0,
	0,
	123,
	456,
	0,
	"NaN",
	"NaN",
	4096,
	"NaN",
	127,
	"NaN",
	-96
]
-- End --