# Get this entry as `Float`
	#
	# If the Sqlite type of this entry is not a floating point, it will be `CAST`
	# to float. If `null`, returns 0.0.
	#
	# require: `self.statement.is_open`
	fun to_f: Float
	do
		assert statement_closed: statement.is_open

		return statement.native_statement.column_double(index)
	end