Seth Axen

> I am speaking about this > > [https://juliamanifolds.github.io/Manifolds.jl/previews/PR535/manifolds/stiefel.html#ManifoldsBase.inverse_retract-Tuple{MetricManifold{ℝ,%20var%22#s113%22,%20var%22#s112%22}%20where%20{var%22#s113%22%3C:Stiefel,%20var%22#s112%22%3C:StiefelSubmersionMetric},%20Any,%20Any,%20ProjectionInverseRetraction}](https://juliamanifolds.github.io/Manifolds.jl/previews/PR535/manifolds/stiefel.html#ManifoldsBase.inverse_retract-Tuple%7BMetricManifold%7B%E2%84%9D,%20var%22#s113%22,%20var%22#s112%22%7D%20where%20%7Bvar%22#s113%22%3C:Stiefel,%20var%22#s112%22%3C:StiefelSubmersionMetric%7D,%20Any,%20Any,%20ProjectionInverseRetraction%7D) > > retraction (or its inverse) and this > > [https://juliamanifolds.github.io/Manifolds.jl/previews/PR535/manifolds/stiefel.html#ManifoldsBase.inverse_retract-Tuple{MetricManifold{ℝ,%20var%22#s113%22,%20var%22#s112%22}%20where%20{var%22#s113%22%3C:Stiefel,%20var%22#s112%22%3C:StiefelSubmersionMetric},%20Any,%20Any,%20ShootingInverseRetraction}](https://juliamanifolds.github.io/Manifolds.jl/previews/PR535/manifolds/stiefel.html#ManifoldsBase.inverse_retract-Tuple%7BMetricManifold%7B%E2%84%9D,%20var%22#s113%22,%20var%22#s112%22%7D%20where%20%7Bvar%22#s113%22%3C:Stiefel,%20var%22#s112%22%3C:StiefelSubmersionMetric%7D,%20Any,%20Any,%20ShootingInverseRetraction%7D) > > Both could be inverse retractions just for Stiefel...

Does this require depending on a specific quaternion implementation?

There's (at least) Quaternions.jl (the most used) and Quaternionic.jl. Quaternions is working to drop its only dependency (https://github.com/JuliaGeometry/Quaternions.jl/issues/79#issuecomment-1235627348). Then Rotations.jl has a 3x3 matrix whose underlying storage is a unit...

Does the attributes variable name need to be netCDF4-specific? Can't it also be saved with e.g. Zarr?

It's not documented because it's deprecated and will be removed: https://github.com/JuliaStats/Distributions.jl/blob/7831193ecbb70967b9f1af71e1c8f0850b89f3a5/src/multivariate/mvnormal.jl#L223

In terms of default, I think it's most important to give the user the most useful information to decide how to use their time. e.g. if I see nonstop numerical...

Ah, I don't have an example of this specific issue right now, but here's a perhaps related one. In this dataset, `_FillValue` is set to `NaN`, yet the eltype NCDatasets...

Why choose `Union{T,Missing}` instead of `Union{T,Float64}` when `_FillValue=NaN`? For `T

This one has a lot of children and will hit a lot of packages, so it would be nice to fix it if possible. @oxinabox are you suggesting deleting the...

Yes, this would be quite nice. Mostly for installing CmdStan.jl, as in the issue you linked. It would be nice for testing too, but caching a cmdstan build for CI...