Extensible Reference Filters: [issue:123]
Problem
We are running out of ASCII characters to use as prefixes in reference filter short-codes. We've reached a consensus on a more scalable reference syntax (&7563), but we need to formally support it.
Proposal
- Currently supported: #123
- Add support for referencing users via [issue:123],[work_item:123]
- Include support for autocomplete
Edited  by Gabe Weaver