https://golang.org/ref/spec#Constants https://golang.org/ref/spec#Constants > An untyped constant has a default type which is the type to which the constant is

https://golang.org/ref/spec#Constants https://golang.org/ref/spec#Constants > An untyped constant has a default type which is the type to which the constant is implicitly converted in contexts where a typed value is required. The default type for a number (integer) is int. If you were to add a period in that long string of zeros, the default for floating-point is float64.