///
/// Steal breakpoint key by index
///
/// @access private
///
/// @param {Number} $index - index of key
///
/// @return {String}
///
/// @group Internal Functions
///
@function flint-steal-key($index) {
	$length: length(map-keys(flint-get-value("breakpoints")));

	@if not flint-is-number($index) {
		@if not $flint-development-mode {
			@error "Passed $index (#{$index}) is not a number. Function takes index number of breakpoint key.";
		} @else {
			@return false;
		}
	}

	@if $index > $length {
		@if not $flint-development-mode {
			@error "Passed $index (#{$index}) is greater than the length of the config map.";
		} @else {
			@return false;
		}
	}

	@return if($index != 0, nth(map-keys(flint-get-value("breakpoints")), $index), false);
}