Re: const is an overrated concept that is a source of extra typing and maintenance

Const is a very useful concept.
Together with references allow us to write safe, expressive and
efficient code.

For instance:

Vector Normalize(const Vector& v)
{
   const auto len = v.length();
   return Vector(v.x / len, v.y / len);
}

We can read this code as:

"Given a vector called v, with his length called len"

Without const we would have to read as:

"given a variable referring to a vector object, and given a variable
"len" with the state of vector length at line 1 ..."

If you think well, you will realize two different situations.
They are conceptually different.

The code is simpler using const. We don't need to think about
variables.
In that scope v is the vector's name and len is the vector's length
doesn't matter when and where.
The problem has been simplified using const representing exactly what
we want in a safe and efficent way. We also gave tips to the compiler
about immutability.

(Before someone say that references are unnecessary too, I will remind
that the logic in this code would be far different and worst using
pointers.)

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