D1655.diff
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	diff --git a/src/Collections/TraversableUtilities.php b/src/Collections/TraversableUtilities.php
	--- a/src/Collections/TraversableUtilities.php
	+++ b/src/Collections/TraversableUtilities.php
	@@ -23,6 +23,11 @@
	}

	public static function isCountable ($countable) : bool {
	+ if (function_exists('is_countable')) {
	+ // PHP 7.3 has is_countable
	+ return is_countable($countable);
	+ }
	+
	// https://github.com/Ayesh/is_countable-polyfill/blob/master/src/is_countable.php
	return is_array($countable)
	\|\| $countable instanceof Countable