Piddles are not hashes any more:

    $a = zeroes 10,10;
    $$a{FOO} = "bar"

doesn't work. They are currently scalar references (to opaque C structures in finer terms) because of speed as well as syntactic issues. If you want to have a hash, use

    $a->hdr()

which returns a reference to an anonymous hash. Also, subclassing works if you store a piddle in the hash member ``PDL''.

There are also many core enhancements to support Dataflow and Slicing tricks, but these do not introduce any incompatibilities.

Incompatible Changes vs 1.11

rgrep

Order of the arguments has changed.

copy method

No longer copies the header. This may not be a misfeature.