Why is ${python3:Depends} injecting cython3-legacy (Was: obitools: runtime dependency on cython)

[Andreas Tille <andreas@an3as.eu>]

Hi,

I checked debian/obitools.substvars which contains

  python3:Depends=cython3-legacy, python3 (<< 3.12), python3 (>= 3.11~), python3-ipython, python3-sphinx, python3-virtualenv, python3-wheel, python3:any

I wonder what mechanism is responsible for adding cython3-legacy to the
package dependencies.  This looks absolutely unmotivated to me.  Is there
any better way than editing debian/obitools.substvars in d/rules by
adding some override_dh_gencontrol?

Kind regards
    Andreas.

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