[perl #131392] %() creates a Map

[brian d foy]

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It looks like %() with no characters between the parens creates a
Map, but if there's at least one character between the parens, it
creates a Hash. I figure all of these should create a Hash:

    my %hash = %();
    put '1: ', %hash.^name;          # 1: Hash

    my $hash-empty = %();
    put '2: ', $hash-empty.^name;    # 2: Map

    my $hash-space = %( );
    put '3: ', $hash-space.^name;    # 3: Hash

Where is %() documented (other than examples using it)?

    $ perl6 -v
    This is Rakudo version 2017.04.3 built on MoarVM version 2017.04-53-g66c6dda
    implementing Perl 6.c.