From type/Any

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method Slip(--> Slip:D) is nodal

Coerces the invocant to slips.

From type/Array

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multi method Slip(Array:D: --> Slip:D)

Converts the array to a Slip, filling the holes with the type value the Array has been defined with.

my Int @array= [0];
@array[3]=3;
say @array.Slip; # OUTPUT: «(0 (Int) (Int) 3)␤»