I am working on a DataGrid subcomponent and have been accessing the 
columns array frequently, thinking nothing of it I just do something 
like:

... columns[i] ...

but then I saw that the columns getter function does a _columns.slice
(0).

Is the compiler smart enough to figure out i dont really want to clone 
the columns array every time I access it or am I really forcing it to 
copy the array?


tks

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