Can remove AA elements during foreach?

[Nick Sabalausky]

Is this both legal and safe?:

    foreach(key; assocArray)
    if(key != "foobar")
        assocArray.remove("foobar");

If not, then what about this?:

    foreach(key; assocArray.byKey())
    if(key != "foobar")
        assocArray.remove("foobar");