[sv-ec] parametrized timeunit, timeprecision

I'm wondering why this is forbidden to have parametized timeunit,
timeprecision. IE:
module top;
    sub #(10ps) uut();
endmodule
module sub;
    parameter p=1ps;
    timeunit p;
endmodule
 
Such approach will allow new coding styles in SV.
 
DANiel

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