Hello Gnucash developers,

      I was attempting to use the Gnucash Python bindings to apply payments to 
a list of invoices using Customer.ApplyPayment (which maps to 
gncOwnerApplyPaymentSecs on the C side), but it gives an error "TypeError: in 
method 'gncOwnerApplyPaymentSecs', argument 3 of type 'GList *'" when I attempt 
to pass a Python list of lots as the second argument "lots" (third argument on 
the C side).

     Looking at how the SWIG bindings were written, I think the issue may be 
that there is not a type translator that turns Python lists into GList. 
base-typemaps.i has a SWIG type translator on line 269 that converts Python 
lists into GSList objects, but as far as I can tell there isn't one that 
converts Python lists into GList objects.

     Am I correct that this is an issue, or am I missing how the bindings are 
intended to be used? If it's an issue, I could work on a PR to add a type 
translator for GList. Also, has anybody ever tried making bindings using 
GObject introspection instead of SWIG, since Gnucash's API is already 
GLib-based?

Thanks,
Oliver Trevor
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