# Match documents where `field` equals `value`
	#
	# https://docs.mongodb.com/manual/reference/operator/query/eq/#op._S_eq
	#
	# ~~~json
	# {field: {$eq: value} }
	# ~~~
	fun eq(field: String, value: nullable Serializable): MongoMatch do
		self[field] = value
		return self
	end