I've been bitten by similar mistakes in the past, so I think adding some dev 
time validations would be a great idea. 

> On 5 Dec 2014, at 00:47, Colin Yates <[email protected]> wrote:
> 
>> On Thursday, 4 December 2014 16:45:38 UTC, David Nolen  wrote:
>>> On Thu, Dec 4, 2014 at 11:15 AM, Colin Yates <[email protected]> wrote:
>>> 
>>> Of course, the answer is obvious when you spot it: (om/set-state! cursor 
>>> (conj @cursor id)).
>>> 
>>> Numpty points for me :).
>> 
>> By the way I'm more than happy to add more function argument
>> validations to Om for dev time to avoid easy to miss mistakes like
>> this.
>> 
>> :pre & :post conditions emit `assert`s. These can be elided in
>> production via a flag to the ClojureScript compiler.
>> 
>> Thoughts?
>> 
>> David
> 
> +1 for me obviously :).
> 
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