An array subscript will, by default, be evaluated in slice context.

Note that Perl 6 signature allow multi method dispatch that distinguishes between these two cases; 

my @a = 1;
my_sub(@a, 2);

# and
my_sub(1, 2);

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This is possible because lists don't flatten in slice context. (Slice context is something like multi-dimensional list context).

So I know that @a[1] returns a single scalar value, the one that is stored in @a. @a[@other_list_with_many_values] will always produce a list, which is transformed to a capture (think reference here) in generic item context, and to the number of elements in numeric context.

I don't know what @a[@list_with_one_element] returns, but it seems logical that it returns a list as well. If you want it to return a single element, not a list, you can flatten the array: 

@a[|@list_with_one_element];

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In reply to Re: [Perl 6] single-value vs. array slices by moritz
in thread [Perl 6] single-value vs. array slices by John M. Dlugosz

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