Currently assumes it is a string without checking. This causes the following commands to treat garbage memory as strings. I haven't been able to crash the server with this, but I do get some odd collection names:

> db.runCommand(

{create:true}

)

{ "ok" : 1 }

> db.runCommand(

{create:null}

)

{ "ok" : 1 }

> db.createCollection() // same as

{create:undefined} { "ok" : 1 }

> show tables
Status // from create:true
n( // from create: null
ped // from createCollection()

see attached one-line patch for an easy fix which gives a helpful message:

> db.createCollection()
{
"errmsg" : "exception: must pass name of collection to create",
"code" : 15888,
"ok" : 0
}