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From: Simon Wright <simon@pushface.org>
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Subject: Re: troubles learning OOP: expected type "Parent.Some_Child",
 found type Parent'Class
Date: Mon, 12 Feb 2018 18:42:33 +0000
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Date: 2018-02-12T18:42:33+00:00
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"Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> writes:

> On 2018-02-12 19:17, Mehdi Saada wrote:
>
>> Now, I know why I prefered mutant types even before using them.
>
> Mutable instances are always less safe than immutable ones.

Not sure that Mehdi means "mutant" = "mutable".

Though, I don't know what they mean by "mutant".