It is now supported by the MATLAB editor (as of R2022a).
The old ASCII notation is left in some files that we copy as-is from other
sources (e.g. in the contrib/ and m4/ subdirectories).
The particles submodule is not updated at this point, because it is in an
inconsistent state.
[skip ci]
The 'stable' option of intersect(), which keeps the element order of the first
argument, is not available on Octave. Provide a fallback implementation, and
adapt the code.