toSeq(countTable.values) doesn't work

[filip]

This works:
    
    
    var counter = initCountTable[char]()
    for v in counter.values:
       echo v
    
    Run

Documentationation says `toSeq()` "transforms any iterator into a sequence" so 
I would except this to work:
    
    
    var counter = initCountTable[char]()
    echo toSeq(counter.values)
    
    Run

Can someone explain why compilation fails with `Error: undeclared field: 
'values'`