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BIND-POS
Combined from primary sources listed below.

In IterationBuffer§

See primary documentation in context for method BIND-POS 

multi method BIND-POS(IterationBuffer:D: int   $pos, Mu \value)
multi method BIND-POS(IterationBuffer:D: Int:D $pos, Mu \value)

Binds the given value at the given element position and returns it. The IterationBuffer is automatically lengthened if the given element position is beyond the length of the IterationBuffer. An error indicating the index is out of bounds will be thrown for negative position values.

In Subscripts§

See primary documentation in context for method BIND-POS 

multi method BIND-POS (::?CLASS:D: $index, \new)

Expected to bind the value or container new to the slot at position $index, replacing any container that would be naturally found there. This is what is called when you write:

my $x = 10;
@numbers[5] := $x;

The generic Array class supports this in order to allow building complex linked data structures, but for more domain-specific types it may not make sense, so don't feel compelled to implement it. If you don't, users will get an appropriate error message when they try to bind to a positional slot of an object of this type.