Java array typemap of type signed char[] cannot be applied to type const char* in swig v4.2.1

[Golden-Wang]

My use case will have C++ code be compiled with -fsigned-char. I want to typemap char pointer as array of signed char rather than string. I ran into this error when upgrading from an earlier version of swig to the latest v4.2.1. See the example below:

test.i

%module test
%include "arrays_java.i"

%apply signed char[] {const char*};

%include test.h

%{
void bar(const char *s) {
    return;
}

int main() {
    const char *foo = "hello world";
    bar(foo);
    return 0;
}
%}

test.h

void bar(const char*);

Bash Commands

swig -c++ -java -package com.test -outdir . test.i
g++ -I/opt/jdk1.8.0_212/include -I/opt/jdk1.8.0_212/include/linux test_wrap.cxx

Error

test_warp.cxx: In function 'void Java_com_test_testJNI_bar(JNIEnv*, jclass, jbyteArray)':
test_wrap.cxx:915:44: error: invalid conversion from 'char**' to 'signed char**' [-fpermissive]
  915 |   if(!SWIG_JavaArrayInSchar(jenv, &jarr1, (char **)&arg1, jarg1)) return ;

Versions

I found v4.2.0 and v4.2.1 both have this error.
This error does not happen in v4.1.1 and earlier versions, where the example given above can be compiled successfully.
I narrowed down the breaking change to commit 7bba06b by @wsfulton .
Please let me know if my use case is valid and any recommended alternatives.