# Returns the minimum value
	#
	# https://docs.mongodb.com/manual/reference/operator/aggregation/min/
	#
	# ~~~json
	# { $min: <expression> }
	# ~~~
	#
	# `$min` compares both value and type, using the specified BSON comparison
	# order for values of different types.
	fun min(field: String, expression: Serializable): MongoGroup do
		return acc("min", field, expression)
	end