+The exact opposite of L</cast> : it dissociates C<$wiz> magic from the variable.
+You can also pass the magic signature C<$sig> as the second argument.
+This function returns true on success, C<0> when no magic represented by C<$wiz> or C<$sig> could be found in the variable, and croaks if the supplied wizard or signature is invalid.
+
+ # Dispell now.
+ die 'no such magic in $x' unless dispell $x, $wiz;
+
+=head1 CONSTANTS
+
+=head2 C<SIG_MIN>
+
+The minimum integer used as a signature for user-defined magic.
+
+=head2 C<SIG_MAX>
+
+The maximum integer used as a signature for user-defined magic.
+
+=head2 C<SIG_NBR>
+
+ SIG_NBR = SIG_MAX - SIG_MIN + 1
+
+=head2 C<MGf_COPY>
+
+Evaluates to true iff the 'copy' magic is available.
+
+=head2 C<MGf_DUP>
+
+Evaluates to true iff the 'dup' magic is available.
+
+=head2 C<MGf_LOCAL>
+
+Evaluates to true iff the 'local' magic is available.
+
+=head2 C<VMG_UVAR>
+
+When this constant is true, you can use the C<fetch,store,exists,delete> callbacks on hashes.
+
+=head2 C<VMG_COMPAT_ARRAY_PUSH_NOLEN>
+
+True for perls that don't call 'len' magic when you push an element in a magical array.
+
+=head2 C<VMG_COMPAT_ARRAY_UNSHIFT_NOLEN_VOID>
+
+True for perls that don't call 'len' magic when you unshift in void context an element in a magical array.
+
+=head2 C<VMG_COMPAT_ARRAY_UNDEF_CLEAR>
+
+True for perls that call 'clear' magic when undefining magical arrays.
+
+=head2 C<VMG_COMPAT_SCALAR_LENGTH_NOLEN>
+
+True for perls that don't call 'len' magic when taking the C<length> of a magical scalar.
+
+=head2 C<VMG_PERL_PATCHLEVEL>
+
+The perl patchlevel this module was built with, or C<0> for non-debugging perls.
+
+=head2 C<VMG_THREADSAFE>
+
+True iff this module could have been built with thread-safety features enabled.
+
+=head2 C<VMG_FORKSAFE>
+
+True iff this module could have been built with fork-safety features enabled.
+This will always be true except on Windows where it's false for perl 5.10.0 and below .
+
+=head2 C<VMG_OP_INFO_NAME>
+
+Value to pass with C<op_info> to get the current op name in the magic callbacks.
+
+=head2 C<VMG_OP_INFO_OBJECT>