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allocate
Combined from primary sources listed below.

In role Blob§

See primary documentation in context for method allocate 

multi method allocate(Blob:U: Int:D $elements)
multi method allocate(Blob:U: Int:D $elements, int $value)
multi method allocate(Blob:U: Int:D $elements, Int:D \value)
multi method allocate(Blob:U: Int:D $elements, Mu:D $got)
multi method allocate(Blob:U: Int:D $elements, int @values)
multi method allocate(Blob:U: Int:D $elements, Blob:D $blob)
multi method allocate(Blob:U: Int:D $elements, @values)

Returns a newly created Blob object with the given number of elements. Optionally takes a second argument that indicates the pattern with which to fill the Blob: this can be a single (possibly native) integer value, or any Iterable that generates integer values, including another Blob. The pattern will be repeated if not enough values are given to fill the entire Blob.

my Blob $b0 = Blob.allocate(10,0);
$b0.say; # OUTPUT: «Blob:0x<00 00 00 00 00 00 00 00 00 00>␤»

If the pattern is a general Mu value, it will fail.