PECL DTrace Package into core?

この辺（１・２）を見ていて気になったのが、PECL DTrace PackageがPHPアーカイブ中に含まれるようになった？
PHP Sources Snapshotsからソース一式を落としてきてgrepで確認。。。PHP6かららしい。
デフォルトでは有効にならず、コンパイル・オプションに「--enable-dtrace」が必要みたいですが、個人的にはPHPアーカイブ中に含まれるようになったのは嬉しいなっと。
それにしても、追加に関する意思決定はいつ頃行われたのだろうか。。。レポジトリには（今日時点で）役４ヶ月前くらいに投入されているようですが。

% cd /usr/local/src
% gtar zxf ./php5.2-200911160130.tar.gz
% gtar zxf ./php5.3-200911160130.tar.gz
% gtar zxf ./php6.0-200911160130.tar.gz
% grep -rn dtrace .
./php6.0-200911160130/aclocal.m4:2878:dnl Generate dtrace targets
./php6.0-200911160130/aclocal.m4:2898:  dtrace -G -o $1.o -s $1 $obj
./php6.0-200911160130/aclocal.m4:2904:dnl Link given source files with dtrace
./php6.0-200911160130/aclocal.m4:2925:dnl Generate platform specific dtrace header
./php6.0-200911160130/aclocal.m4:2928:  dtrace -h -C -s $1 -o $2
./php6.0-200911160130/main/main.c:84:#include "zend_dtrace.h"
./php6.0-200911160130/configure:1068:  --enable-dtrace         Enable DTrace support"
./php6.0-200911160130/configure:18607:php_enable_dtrace=no
./php6.0-200911160130/configure:18611:# Check whether --enable-dtrace or --disable-dtrace was given.
./php6.0-200911160130/configure:18612:if test "${enable_dtrace+set}" = set; then
./php6.0-200911160130/configure:18613:  enableval="$enable_dtrace"
./php6.0-200911160130/configure:18676:       Zend/zend_dtrace.c Zend/zend.c; do
./php6.0-200911160130/configure:18686:  dtrace -h -C -s Zend/zend_dtrace.d -o Zend/zend_dtrace_gen.h
./php6.0-200911160130/configure:18687:  $SED -ibak 's,PHP_,DTRACE_,g' Zend/zend_dtrace_gen.h
./php6.0-200911160130/configure:108430:    zend_alloc.c zend_compile.c zend_constants.c zend_dtrace.c \
./php6.0-200911160130/configure:108604:  PHP_GLOBAL_OBJS="$PHP_GLOBAL_OBJS Zend/zend_dtrace.d.o"
./php6.0-200911160130/configure:108615:Zend/zend_dtrace.d.o: \$(PHP_DTRACE_OBJS)
./php6.0-200911160130/configure:108616: dtrace -G -o Zend/zend_dtrace.d.o -s Zend/zend_dtrace.d $obj
./php6.0-200911160130/acinclude.m4:2878:dnl Generate dtrace targets
./php6.0-200911160130/acinclude.m4:2898:        dtrace -G -o $1.o -s $1 $obj
./php6.0-200911160130/acinclude.m4:2904:dnl Link given source files with dtrace
./php6.0-200911160130/acinclude.m4:2925:dnl Generate platform specific dtrace header
./php6.0-200911160130/acinclude.m4:2928:  dtrace -h -C -s $1 -o $2
./php6.0-200911160130/Zend/zend_dtrace.h:33:ZEND_API zend_op_array *(*zend_dtrace_compile_file)(zend_file_handle *file_handle, int type TSRMLS_DC);
./php6.0-200911160130/Zend/zend_dtrace.h:34:ZEND_API void (*zend_dtrace_execute)(zend_op_array *op_array TSRMLS_DC);
./php6.0-200911160130/Zend/zend_dtrace.h:35:ZEND_API void (*zend_dtrace_execute_internal)(zend_execute_data *execute_data_ptr, int return_value_used TSRMLS_DC);
./php6.0-200911160130/Zend/zend_dtrace.h:37:ZEND_API zend_op_array *dtrace_compile_file(zend_file_handle *file_handle, int type TSRMLS_DC);
./php6.0-200911160130/Zend/zend_dtrace.h:38:ZEND_API void dtrace_execute(zend_op_array *op_array TSRMLS_DC);
./php6.0-200911160130/Zend/zend_dtrace.h:39:ZEND_API void dtrace_execute_internal(zend_execute_data *execute_data_ptr, int return_value_used TSRMLS_DC);
./php6.0-200911160130/Zend/zend_dtrace.h:40:#include <zend_dtrace_gen.h>
./php6.0-200911160130/Zend/zend_execute.c:40:#include "zend_dtrace.h"
./php6.0-200911160130/Zend/zend.c:33:#include "zend_dtrace.h"
./php6.0-200911160130/Zend/zend.c:1138:/* build with dtrace support */
./php6.0-200911160130/Zend/zend.c:1139: zend_compile_file = dtrace_compile_file;
./php6.0-200911160130/Zend/zend.c:1140: zend_execute = dtrace_execute;
./php6.0-200911160130/Zend/zend.c:1141: zend_execute_internal = dtrace_execute_internal;
./php6.0-200911160130/Zend/zend.c:1595:         char *dtrace_error_buffer;
./php6.0-200911160130/Zend/zend.c:1596:         zend_vspprintf(&dtrace_error_buffer, 0, format, args);
./php6.0-200911160130/Zend/zend.c:1597:         DTRACE_ERROR(dtrace_error_buffer, error_filename, error_lineno);
./php6.0-200911160130/Zend/zend.c:1598:         efree(dtrace_error_buffer);
./php6.0-200911160130/Zend/zend_exceptions.c:30:#include "zend_dtrace.h"
./php6.0-200911160130/Zend/zend_dtrace.c:23:#include "zend_dtrace.h"
./php6.0-200911160130/Zend/zend_dtrace.c:27:static inline char *dtrace_get_executed_filename(TSRMLS_D)
./php6.0-200911160130/Zend/zend_dtrace.c:36:ZEND_API zend_op_array *dtrace_compile_file(zend_file_handle *file_handle, int type TSRMLS_DC)
./php6.0-200911160130/Zend/zend_dtrace.c:47:ZEND_API void dtrace_execute(zend_op_array *op_array TSRMLS_DC)
./php6.0-200911160130/Zend/zend_dtrace.c:59:            filename = dtrace_get_executed_filename(TSRMLS_C);
./php6.0-200911160130/Zend/zend_dtrace.c:72:               we use appropriate predicates in our dtrace scripts to detect if we are in class context */
./php6.0-200911160130/Zend/zend_dtrace.c:104:ZEND_API void dtrace_execute_internal(zend_execute_data *execute_data_ptr, int return_value_used TSRMLS_DC)
./php6.0-200911160130/Zend/zend_dtrace.c:109:           filename = dtrace_get_executed_filename(TSRMLS_C);
./php6.0-200911160130/configure.in:891:PHP_ARG_ENABLE(dtrace, whether to enable DTrace support,
./php6.0-200911160130/configure.in:892:[  --enable-dtrace         Enable DTrace support], no, no)
./php6.0-200911160130/configure.in:898:    [PHP_ADD_DTRACE([Zend/zend_dtrace.d], [main/main.c, Zend/zend_API.c \
./php6.0-200911160130/configure.in:900:       Zend/zend_dtrace.c Zend/zend.c])
./php6.0-200911160130/configure.in:901:     PHP_INIT_DTRACE([Zend/zend_dtrace.d], [Zend/zend_dtrace_gen.h])
./php6.0-200911160130/configure.in:1365:    zend_alloc.c zend_compile.c zend_constants.c zend_dtrace.c \
./php6.0-200911160130/configure.in:1400:      PHP_GENERATE_DTRACE([Zend/zend_dtrace.d],$php_build_target);;
% ./php6.0-200911160130/configure --help | grep dtrace
  --enable-dtrace         Enable DTrace support
%