what exactly is string length?

[mw]

On Friday, 2 April 2021 at 04:43:48 UTC, rikki cattermole wrote:
> On 02/04/2021 5:38 PM, mw wrote:
>> On Friday, 2 April 2021 at 04:36:01 UTC, rikki cattermole 
>> wrote:
>>> On 02/04/2021 5:32 PM, mw wrote:
>>>> ---
>>>> import std;
>>>> import std.conv : text;
>>>>
>>>>
>>>> void main()
>>>> {
>>>>     char[6] s;
>>>>     s = "abc";
>>>>     writeln(s, s.length);  // abc6, ok it's the static 
>>>> array's length
>>>>
>>>>     string t = text("head-", s, "-tail");
>>>>     writeln(t, t.length);  // head-abc-tail16, why?
>>> assert(t[9] == '\0');
>>>> }
>>>> ---
>> 
>> I don't get it, what do you mean by the assertion:
>> 
>> 
>> assert(t[9] == '\0');
>> 
>> 
>> t == "head-abc-tail"
>
> Not all characters can be printed such as NULL.
>
> [104, 101, 97, 100, 45, 97, 98, 99, 0, 0, 0, 45, 116, 97, 105, 
> 108]

So you mean inside the writeln() call, the 0s are skipped?

Well, if I use `string t` as filename, it will try to looking for 
a file called:

"head-abc\0\0\0-tail" instead of just "head-abc-tail" ?

or it's platform dependent?