Astrid,

I don't think that the get operator the same as the normal filtering 
operators because it operates on each tiddler in the returned list instead 
of the list itself. So it lists all the tiddlers that match the filter 
without the get operator, and then outputs the value of the  field for each 
tiddler, so the get operator would be shorthand for

<$list filter='[tag[someTag]]'>
<$transclude tiddler=<<currentTiddler>> field=someField/>
</$list>

which, when using the get operator, could be written as

<$list filter='[tag[someTag]get[someField]]'>

</$list>

I am not  sure if that is actually how the code works, but that is 
consistent with the output I have gotten when testing filters. The default 
filter if you just use < $list/> appears to be [!is[system]] so 
[get[fieldName]] is consistent with this behavior. I don't know if there 
are any other operators that work similarly.
I don't know if there is any time when this behavior would be useful, maybe 
listing given names of people where not everyone has a unique given name?

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