Converting value from one data type to another is known as casting in SeqZap.
Some data types are directly convertible between one type and another, for instance, you can assign a decimal variable an integer value such as 42 without any problems. SeqZap allows you to do this conversion directly because no information is lost when concerting an integer to a decimal value.
Converting the other way, assigning an integer variable a value such as 3.14 is not allowed directly because SeqZap does not want you to accidentally lose any information. So to convert a decimal value to an integer you have to use a casting function.
Most casting function are called the same as the data type which you want to convert to, for instance, to convert a decimal value to an integer you would use the integer(decimal) function.