# Array size match
	#
	# https://docs.mongodb.com/manual/reference/operator/query/size/#op._S_size
	#
	# `$size` matches any array with the number of elements specified by the argument
	#
	# ~~~json
	# { field: { $size: <size> } }
	# ~~~
	fun size(field: nullable String, size: Int): MongoMatch do
		op("size", field, size)
		return self
	end