Bug or feature storage class alias

[Freddy via Digitalmars-d]

Is this a bug or a feature
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import std.stdio;

int global;

alias cGlobal = const global;
alias sGlobal = shared global;

void main()
{
    global = 5;
    writeln(cGlobal);
    global = 7;
    writeln(sGlobal);
}
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