> 1e7

Is a float literal.

Not in Go. Number literals don't have a type until they're assigned to a variable or used in a place that implies a type (e.g. a function argument). For example, the following is valid:

  var u uint32 = 10000000000.0 / 100000

even though 10000000000 overflows uint32 and it's also written like a floating-point literal.

> Not in Go.

Yes in go. `var u = 1e7` gives a float. That means 1e7 is a float literal. You can coerce it to an integer by explicitly typing the target, but it's still a float literal.

`1e7` is an untyped numeric constant with a default type of float64.

https://blog.golang.org/constants

https://golang.org/ref/spec#Constants

Mysterious hacker news downvoting! This my preferred way of writing numbers with lots of 0s as well.

But underscores also work for numbers that don't have lot of zeros. Compare:

    12_345_678
    1.2345678e7

good point.

Kind of realising how much of my daily work could use bytes as the main numeric type