Go doesn’t have a primitive decimal type for arbitrary-precision fixed-point decimal numbers. Yes, you read it right. Therefore, if you need to deal with fixed-point precision there are two main options:

• Use an external package like decimal, which introduces the decimal type. However, the current version (1.3.1), can “only” represent numbers with a maximum of 2^31 digits after the decimal point.
• Use int64 to store and deal with these numbers. For e.g. given you need 6 precision digits, therefore 79.23, 23.00, and 54.123456, become respectively 79230000, 23000000, and 54123456.

There is an open proposal to add decimal float types (IEEE 754-2008) in the std lib. However, for now, it’s just a proposal being discussed, without guarantee it will be ever added.