I admit, this issue report is on the verge of nitpicking, but nevertheless...

The count argument for the Enumerable.Repeat method currently states:

The number of times to repeat the value in the generated sequence

This is of course incorrect :)
In fact, the value is repeated count-1 times in the generated sequence; when count is being 0 the generated sequence is empty.

A more accurate description for the count argument could perhaps be something like:

The number of times the value occurs in the generated sequence

Github link to the respective line in the documentation source:

Link to documentation: https://docs.microsoft.com/en-us/dotnet/api/system.linq.enumerable.repeat?view=netstandard-2.1