https://stitcher.io/blog/new-in-php-83#the-small-deprecations-rfc-rfc

1. Deprecate passing negative $widths to mb_strimwidth()
   1. I cannot see any use of mb_strimwidth in core
2. Deprecate and remove the NumberFormatter::TYPE_CURRENCY constant
   1. I cannot see any use of TYPE_CURRENCY in core
3. Deprecate and remove the broken pre-PHP 7.1 Mt19937 implementation (MT_RAND_PHP)
   1. I cannot see any use of MT_RAND_PHP in core
4. Deprecate and remove calling ldap_connect() with 2 parameters $host and $port
   1. Used in ADODB
5. Deprecate remains of string evaluated code assertions
   1. No use of assert_options
   2. No use of assert\. (ini set/fetch)
   3. I can't see any use of assert() being passed to anything else

Required

1. adodb
   1. Check upstream for fix
2. assertions
   1. Confirm lack of assert_options and assert\.
   2. Confirm no call to assert() is passed to anything that would depend upon its return value
3. All others:
   1. Confirm that they are not in use in core