*** a/src/pl/plperl/plperl_helpers.h
--- b/src/pl/plperl/plperl_helpers.h
***************
*** 5,23 ****
   * convert from utf8 to database encoding
   */
  static inline char *
! utf_u2e(const char *utf8_str, size_t len)
  {
! 	int 	    enc = GetDatabaseEncoding();
! 
! 	char	   *ret = (char *) pg_do_encoding_conversion((unsigned char *) utf8_str, len, PG_UTF8, enc);
  
  	/*
! 	* when we are a PG_UTF8 or SQL_ASCII database
! 	* pg_do_encoding_conversion() will not do any conversion or
! 	* verification. we need to do it manually instead.
  	*/
  	if (enc == PG_UTF8 || enc == PG_SQL_ASCII)
! 		pg_verify_mbstr_len(PG_UTF8, utf8_str, len, false);
  
  	if (ret == utf8_str)
  		ret = pstrdup(ret);
--- 5,24 ----
   * convert from utf8 to database encoding
   */
  static inline char *
! utf_u2e(char *utf8_str, size_t len)
  {
! 	int		   enc = GetDatabaseEncoding();
! 	char	   *ret = utf8_str;
  
  	/*
! 	* when we are a PG_UTF8 or SQL_ASCII database pg_do_encoding_conversion()
! 	* will not do any conversion or verification. we need to do it manually
! 	* instead.
  	*/
  	if (enc == PG_UTF8 || enc == PG_SQL_ASCII)
! 		pg_verify_mbstr_len(enc, utf8_str, len, false);
! 	else
! 		ret = (char *) pg_do_encoding_conversion((unsigned char *) utf8_str, len, PG_UTF8, enc);
  
  	if (ret == utf8_str)
  		ret = pstrdup(ret);
***************
*** 66,72 **** sv2cstr(SV *sv)
  		 * we are done */
  		SvREFCNT_inc(sv);
  
! 	val = SvPVutf8(sv, len);
  
  	/*
  	 * we use perl's length in the event we had an embedded null byte to ensure
--- 67,80 ----
  		 * we are done */
  		SvREFCNT_inc(sv);
  
! 	/*
! 	 * when SQL_ASCII just treat it as byte soup, that is fetch the string out
! 	 * however it is currently stored by perl
! 	 */
! 	if (GetDatabaseEncoding() == PG_SQL_ASCII)
! 		val = SvPV(sv, len);
! 	else
! 		val = SvPVutf8(sv, len);
  
  	/*
  	 * we use perl's length in the event we had an embedded null byte to ensure
***************
*** 89,99 **** static inline SV *
  cstr2sv(const char *str)
  {
  	SV		   *sv;
! 	char	   *utf8_str = utf_e2u(str);
  
  	sv = newSVpv(utf8_str, 0);
  	SvUTF8_on(sv);
- 
  	pfree(utf8_str);
  
  	return sv;
--- 97,112 ----
  cstr2sv(const char *str)
  {
  	SV		   *sv;
! 	char	   *utf8_str;
! 
! 	/* no conversion when SQL_ASCII */
! 	if (GetDatabaseEncoding() == PG_SQL_ASCII)
! 		return newSVpv(str, 0);
! 
! 	utf8_str = utf_e2u(str);
  
  	sv = newSVpv(utf8_str, 0);
  	SvUTF8_on(sv);
  	pfree(utf8_str);
  
  	return sv;