Can you elaborate on motivating code patterns? Every instance where I've 
wanted to determine if a specific module is around has been a compile time 
question for meta-programming purposes, and the `Code.ensure_loaded?` 
function has worked great for that.

On Sunday, February 25, 2018 at 6:56:25 PM UTC-5, [email protected] wrote:
>
> I've found that in practice both `Code.ensure_loaded` and 
> `Code.ensure_compiled?` are both extremely slow in practice. Also it is not 
> very intuitive that this is what you should be reaching for when attempting 
> to check what type something is. The standard pattern that has been 
> established is the "is_*" in the Kernel. I think we should continue that 
> pattern with modules as well.
>

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