SWIG syntax error on list initializer of template ctor parameter

Meta-issue: Is it better to ask questions here, or on SO?  (SO is easier.)

It's been awhile since I've done C++ coding, and I'm new to SWIG.  I posted
my code to https://github.com/performantdata/swig-issue-2020-09/

I'm trying to define an instance of a fully-specialized template and make
it visible to Java.  The template ctor takes one parameter, a std::array.
When I use a braced-init-list in the C++ header:

```
const A<char, 3> A3(std::array<char, 3>{'A','B','C'});
```

that seems fine to C++.  But when I specify that in the .i file, SWIG
fails with "Error: Syntax error in input(1)."  If I remove the initializer
list, SWIG succeeds, but the C++ compilation of the SWIG-generated wrapper
fails, because it doesn't pass a parameter to the A ctor.