[test] less verbose exit_code test. check $ENV{TEST_VERBOSE}
trace: better array traces, print size also
[pmc] fix splice overflows with negative count

throw illegal argument with negative count arguments for now.
[pmc] fixup splice overflows with negative count

throw illegal argument with negative count arguments for now.
[pmc] fixup splice overflows with negative count

throw illegal argument with negative count arguments for now.
[pmc] harmonize out of bounds exception strings

use less static string memory, but translate it. no context.
"illegal argument" for unsupported negative arguments.
[pmc] allow negative resizablefloatarray keys
[test] change array tests to new harmonized out of bounds exceptions