Localised variables become exposed to environment when FUNCNEST reached

[felix]

Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS: -g -O2
uname output: Linux medium 5.10.0-19-amd64 #1 SMP Debian 5.10.149-2 
(2022-10-21) x86_64 GNU/Linux
Machine Type: x86_64-pc-linux-gnu

Bash Version: 5.2
Patch Level: 12
Release Status: release

Description:
        Localised variable in a function could alter environ when FUNCNEST is 
reached

Repeat-By:
        $ funcTest() { local FUNCNEST=1 LocalVar=Not\ Global;$FUNCNAME;}
        $ echo $LocalVar

        $ funcTest
        bash: funcTest: maximum function nesting level exceeded (1)
        $ echo $LocalVar
        Not Global

( Once playing with this, don't miss to `unset FUNCNEST`! ;-)