Why std.array : array needs pure postblit?

[Andrea Fontana]

On Friday, 15 June 2018 at 11:25:49 UTC, Basile B. wrote:

>> Hello, i've tested locally and it can works by making 
>> `Appender.reserve()` and `Appender.ensureAddable()` function 
>> templates.
>>

That was my idea too. But I wonder if pureness of reserve and 
ensureAddable have a particular reason.