The keys command doesn't work with keybinding maps

[xiaq]

What happened, and what did you expect to happen?

~> keys $edit:insert:binding
Exception: cannot iterate keys of !!edit.bindingsMap
  [tty 2]:1:1-25: keys $edit:insert:binding

Output of "elvish -version"

0.22.0-dev.0.20241231154107-53f77e671385-dirty

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