> On 20 juil. 2016, at 14:21, Xiaodi Wu <xiaodi...@gmail.com> wrote:
> 
> Doesn't your second argument undermine your first? If it's a trivial solution 
> and one rarely ever considers empty strings when invoking `hasPrefix`, then 
> returning the technically correct result must be a trivial departure in 
> behavior.

I specifically used an example where the trivial solution (y=0 instead of 
y=exp(x)) is a pitfall.

How many empty strings are contained in any given string?
If the answer is infinitely many, it sounds like a pitfall to me.

Cheers,
Guillaume Lessard

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