std.algorithm.remove()复制数组项?

我有一个数组,需要按索引从中删除项出于某种原因,它会复制数组中的其他项以取代已删除项这是一个例子。

import std.stdio: writeln;
import std.algorithm: remove;

void main() {
    string[string] assocArray = [
        "firstvalue": "Number 1",
        "secondvalue": "Number 2",
        "thirdvalue": "Number 3",
        "fourthvalue": "Number 4",
        "fifthvalue": "Number 5",
        "sixthvalue": "Number 6",
    ];

    string[] assocArrayKeys = assocArray.keys(); // I know these aren't in the same order as the literal.

    writeln(assocArrayKeys);
    // ["thirdvalue", "fourthvalue", "fifthvalue", "sixthvalue", "firstvalue", "secondvalue"]

    assocArrayKeys.remove(0);
    assocArrayKeys.remove(5);

    writeln(assocArrayKeys);
    // ["fourthvalue", "fifthvalue", "sixthvalue", "firstvalue", "secondvalue", "secondvalue"]
    // It did remove them, but there are now two "secondvalue"s.
}

任何帮助都将不胜感激。