Ensure that numeric strings followed by non-whitespace are treated as NaN.

-- Testcase --
{%
printf("%.J\n", [
	"1" == 1,
	" 1" == 1,
	"1 " == 1,
	"1a" == 1,
	"1 a" == 1
]);
%}
-- End --

-- Expect stdout --
[
	true,
	true,
	true,
	false,
	false
]
-- End --