Backport PR
#10496: Define `_repr_mimebundle_`...
Backport PR
#10496: Define `_repr_mimebundle_`
Allows objects to display arbitrary mime-types by returning a mimebundle. This is getting increasingly important as custom mime-types are growing in popularity.
- mime-bundle is computed first, but other formatters are still called
- if a mime-type is present in repr-mimebundle, `_repr_<mime>_` will not be called (avoids redundant calls for backward-compatible objects)
closes 10090
cc rgbkrk
Alternative design: rather than single method returning the mimebundle itself, return mime-keyed mapping to callables, e.g.:
```python
def _repr_mime_methods_(self):
return {
'text/html': self._repr_html_,
}
```
Another more minor alternative: rather than allowing return of `data` or `(data, metadata)`, require returning the full mime-bundle with `data`, `metadata` keys:
```python
def _repr_mimebundle(self):
return {
'data': {
'application/vnd.foo+json': [1,2,3],
},
}
```
