Attempt to document method 'isa' in Mu

gistfile1.txt

=head2 routine isa

    multi method isa(Mu $type)      returns Bool:D
    multi method isa(Str:D $type)   returns Bool:D

Returns C<True> if the invocant is an instance of class C<$type>, a subset type or a derived class (through inheritance) of C<$type>.

    my $i = 17;
    say $i.isa("Int");   # True
    say $i.isa(Any);     # True

A more idiomatic way to do this is to use the smartmatch operator C<~~>.

    my $s = "String";
    say $i ~~ Str;       # True