Named constructors

[Per Nordlöw]

On Thursday, 12 December 2024 at 07:55:14 UTC, Per Nordlöw wrote:
> On Saturday, 9 November 2024 at 00:02:52 UTC, JN wrote:
>> Let's say you want to have an Angle class, which holds radians 
>> internally but can be initialized with degrees or radians.

1. Note however that when you already have written `Radians` and 
`Degrees` and their mutual conversion there's no need to write 
`Angle`.

2. Some would argue that it's better to use the singular forms 
`Radian` and `Degree` instead.