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In the Process Expansions chapter the following code is given:

let array = @(cmd args...)

I expected this to produce an array that I could access using @array. It instead produces a string $array. I eventually figured out that I need to use let array = [ @(cmd args...) ] to perform a deep copy.

The example should be changed to let array = [ @(cmd args...) ] and include a link to https://doc.redox-os.org/ion-manual/html/variables/02-arrays.html#copy-array-into-a-new-array as a reminder of the reason for the square brackets.