BlameHunk line numbers are zero-based?

var x = 5;  // just an example
var options = new BlameOptions {MinLine = x, MaxLine = x};
var hunks = repository.Blame(path, options);
var hunk = hunks.HunkForLine(x);  // throws ArgumentOutOfRangeException: 'No hunk for that line'

It seems that though the line numbers in BlameOptions are one-based (according to the code comments), BlameHunkCollection.HunkForLine, BlameHunk.ContainsLine, BlameHunk.FinalStartLineNumber and BlameHunk.InitialStartLineNumber are all zero based.

Is this a bug, or intentional? If intentional, it would be good to add to the comments on all of these which base is to be expected. Thanks.

I can subtract one in the HunkForLine call to work around for now.

Start with BlameOptions, BlameHunkCollection.HunkForLine, BlameHunk.ContainsLine, and the FinalStartLineNumber and InitialStartLineNumber properties. Reproduce the shown call, compare the documented and observed indexing, and determine whether the APIs should be aligned or explicitly documented; done means the behavior is consistent or clearly specified.