Weird errors caused by making Rakudo::Internals Uninstantiable

gistfile1.txt

diff --git a/src/core/core_prologue.pm b/src/core/core_prologue.pm
index 3d5ddcc..15ac8a4 100644
--- a/src/core/core_prologue.pm
+++ b/src/core/core_prologue.pm
@@ -5,7 +5,7 @@ my class HyperWhatever { ... }
 my class WhateverCode { ... }
 my class Cursor { ... }
 my class Failure { ... }
-my class Rakudo::Internals { ... }
+my class Rakudo::Internals is repr('Uninstantiable') { ... }
 
 # Stub these or we can't use any sigil other than $.
 my role Positional { ... }

gistfile2.txt

$ 6l 'Pair.new("a",42).perl'
Cannot call perl(Pair: Any); none of these signatures match:
    (Mu:U $: *%_)
    (Mu:D $: *%_)
    (Pair:D $: :$arglist, *%_)
   at gen/moar/m-CORE.setting:18084  (/Users/liz/Github/rakudo.moar/install/share/perl6/runtime/./CORE.setting.moarvm:throw:186)
 from gen/moar/m-CORE.setting:20118  (/Users/liz/Github/rakudo.moar/install/share/perl6/runtime/./CORE.setting.moarvm::48)
 from gen/moar/m-BOOTSTRAP.nqp:2322  (blib/Perl6/BOOTSTRAP.moarvm::718)
 from gen/moar/m-CORE.setting:1196  (/Users/liz/Github/rakudo.moar/install/share/perl6/runtime/./CORE.setting.moarvm:perl:36)
 from gen/moar/m-CORE.setting:15165  (/Users/liz/Github/rakudo.moar/install/share/perl6/runtime/./CORE.setting.moarvm::42)
 from gen/moar/m-CORE.setting:15165  (/Users/liz/Github/rakudo.moar/install/share/perl6/runtime/./CORE.setting.moarvm:perl:81)
 from gen/moar/m-CORE.setting:1196  (/Users/liz/Github/rakudo.moar/install/share/perl6/runtime/./CORE.setting.moarvm:perl:39)
 from -e:1  (<ephemeral file>:<unit>:34)
 from -e:1  (<ephemeral file>:<unit-outer>:10)
 from gen/moar/stage2/NQPHLL.nqp:1294  (/Users/liz/Github/rakudo.moar/install/share/nqp/lib/NQPHLL.moarvm:eval:190)
 from gen/moar/stage2/NQPHLL.nqp:1384  (/Users/liz/Github/rakudo.moar/install/share/nqp/lib/NQPHLL.moarvm::35)
 from gen/moar/stage2/NQPHLL.nqp:1381  (/Users/liz/Github/rakudo.moar/install/share/nqp/lib/NQPHLL.moarvm:command_eval:155)
 from src/Perl6/Compiler.nqp:65  (blib/Perl6/Compiler.moarvm:command_eval:93)
 from gen/moar/stage2/NQPHLL.nqp:1365  (/Users/liz/Github/rakudo.moar/install/share/nqp/lib/NQPHLL.moarvm:command_line:114)
 from gen/moar/m-main.nqp:39  (/Users/liz/Github/rakudo.moar/install/share/perl6/runtime/perl6.moarvm:MAIN:18)
 from gen/moar/m-main.nqp:35  (/Users/liz/Github/rakudo.moar/install/share/perl6/runtime/perl6.moarvm:<mainline>:197)
 from <unknown>:1  (/Users/liz/Github/rakudo.moar/install/share/perl6/runtime/perl6.moarvm:<main>:8)
 from <unknown>:1  (/Users/liz/Github/rakudo.moar/install/share/perl6/runtime/perl6.moarvm:<entry>:9)