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Reset position setting

Shouldn't be included in column position mixin already the reset for the position? Because now I have to write this: 

.column {
 @include grid-column(6 ,position: center);

 @include breakpoint(medium){
  @include grid-col-unpos();
  @include grid-col-pos(2);
 }
}

Do we not want always override the position attributes, when we are using the grid-col-mixin? The grid-col-unpos looks little be redudant than, or? What's the idea behind the seperate mixins?

positioncolumncenter

Shouldn't be included in column position mixin already the reset for the position? Because now I have to write this: 

.column {
 @include grid-column(6 ,position: center);

 @include breakpoint(medium){
  @include grid-col-unpos();
  @include grid-col-pos(2);
 }
}

Do we not want always override the position attributes, when we are using the grid-col-mixin? The grid-col-unpos looks little be redudant than, or? What's the idea behind the seperate mixins?