Seal.plugins.useractions keyword arg delivery unreliable

Hi. I'm using Hammerspoon 0.9.73 and Seal commit `ce0b652`. My `init.lua` is as follows:
```
local hyper = {"cmd", "alt", "ctrl", "shift"}
hs.loadSpoon("Seal")
spoon.Seal:loadPlugins({"apps", "useractions"})
spoon.Seal:bindHotkeys({show={hyper, "Space"}})
spoon.Seal.plugins.useractions.actions = {
["Tell me"] = { keyword = "tm", fn = function(str) hs.alert.show(str) end }
}
spoon.Seal:start()
```
I invoke Seal, and type stuff like the following:
> tm foo bar baz random
> tm some more stuff here
> tm hello world
> tm time is a flat circle
> tm "this is a really long quoted string, how do ya like me now?"
> tm xyzzy

Eventually you'll see that the strings that show in the alert are either:
* truncated
* strings from a previous run
* empty

Somehow these strings are getting corrupted, and I'm not sure why. Any ideas?