2020-11-04 [9e38c2bb5] Declare assorted array functions using anycompatible not

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<para>

User-defined objects that reference some built-in array functions

along with their argument types must be recreated (Tom Lane)

</para>

<para>

Specifically, <link

linkend="functions-array"><function>array_append()</function></link>,

<function>array_prepend()</function>,

<function>array_cat()</function>,

<function>array_position()</function>,

<function>array_positions()</function>,

<function>array_remove()</function>,

<function>array_replace()</function>, or <link

linkend="functions-math"><function>width_bucket()</function></link>

used to take <type>anyarray</type> arguments but now take

<type>anycompatiblearray</type>. Therefore, user-defined objects

like aggregates and operators that reference old array function

signatures must be dropped before upgrading and recreated once the

upgrade completes.

</para>

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Author: Tom Lane <tgl@sss.pgh.pa.us>