diff --git a/build/Makefile.gcov b/build/Makefile.gcov
index 13985a93a101e..5097bfaaa2774 100644
--- a/build/Makefile.gcov
+++ b/build/Makefile.gcov
@@ -16,23 +16,6 @@ LCOV_EXCLUDES = \
 	'$(top_srcdir)/parse_date.re' \
 	'$(top_srcdir)/parse_iso_intervals.re'
 
-GCOVR_EXCLUDES = \
-	'ext/bcmath/libbcmath/.*' \
-	'ext/date/lib/.*' \
-	'ext/fileinfo/libmagic/.*' \
-	'ext/gd/libgd/.*' \
-	'ext/hash/sha3/.*' \
-	'ext/lexbor/lexbor/.*' \
-	'ext/mbstring/libmbfl/.*' \
-	'ext/opcache/jit/ir/.*' \
-	'ext/pcre/pcre2lib/.*' \
-	'ext/uri/uriparser/.*'
-
-# These patterns have implicit ^/$ anchors.
-GCOVR_EXCLUDE_LINES_BY_PATTERNS = \
-	'.*\b(ZEND_PARSE_PARAMETERS_(START|END|NONE)|Z_PARAM_).*' \
-	'\s*(default:\s*)?ZEND_UNREACHABLE\(\);\s*'
-
 lcov: lcov-html
 
 php_lcov.info:
@@ -56,15 +39,11 @@ gcovr-html:
 	@echo "Generating gcovr HTML"
 	@rm -rf gcovr_html/
 	@mkdir gcovr_html
-	gcovr -sr . -o gcovr_html/index.html --html --html-details --exclude-unreachable-branches --exclude-throw-branches \
-		$(foreach pattern, $(GCOVR_EXCLUDE_LINES_BY_PATTERNS), --exclude-lines-by-pattern $(pattern)) \
-		$(foreach lib, $(GCOVR_EXCLUDES), -e $(lib))
+	gcovr -r . -o gcovr_html/index.html --html --html-details
 
 gcovr-xml:
 	@echo "Generating gcovr XML"
 	@rm -f gcovr.xml
-	gcovr -sr . -o gcovr.xml --xml --exclude-unreachable-branches --exclude-throw-branches \
-		$(foreach pattern, $(GCOVR_EXCLUDE_LINES_BY_PATTERNS), --exclude-lines-by-pattern $(pattern)) \
-		$(foreach lib, $(GCOVR_EXCLUDES), -e $(lib))
+	gcovr -r . -o gcovr.xml --xml
 
 .PHONY: gcovr-html lcov-html php_lcov.info
diff --git a/ext/curl/config.w32 b/ext/curl/config.w32
index a4bdce59ccb1f..c3a55652b6382 100644
--- a/ext/curl/config.w32
+++ b/ext/curl/config.w32
@@ -12,7 +12,10 @@ if (PHP_CURL != "no") {
 		SETUP_ZLIB_LIB("curl", PHP_CURL) &&
 		(CHECK_LIB("normaliz.lib", "curl", PHP_CURL) &&
 		 CHECK_LIB("libssh2.lib", "curl", PHP_CURL) &&
-		 CHECK_LIB("nghttp2.lib", "curl", PHP_CURL))
+		 CHECK_LIB("nghttp2.lib", "curl", PHP_CURL) &&
+		 CHECK_LIB("brotlidec.lib", "curl", PHP_CURL) &&
+		 CHECK_LIB("brotlicommon.lib", "curl", PHP_CURL) &&
+		 CHECK_LIB("libzstd.lib", "curl", PHP_CURL))
 		) {
 		EXTENSION("curl", "interface.c multi.c share.c curl_file.c");
 		AC_DEFINE('HAVE_CURL', 1, "Define to 1 if the PHP extension 'curl' is available.");
diff --git a/ext/curl/tests/check_win_config.phpt b/ext/curl/tests/check_win_config.phpt
index fc29e37281970..56ebe36312ec0 100644
--- a/ext/curl/tests/check_win_config.phpt
+++ b/ext/curl/tests/check_win_config.phpt
@@ -47,11 +47,11 @@ UNIX_SOCKETS => %r(Yes|No)%r
 PSL => No
 HTTPS_PROXY => Yes
 MULTI_SSL => %s
-BROTLI => %s
+BROTLI => Yes
 ALTSVC => Yes
 HTTP3 => No
 UNICODE => No
-ZSTD => No
+ZSTD => Yes
 HSTS => Yes
 GSASL => No
 Protocols => dict, file, ftp, ftps, gopher, %r(gophers, )?%rhttp, https, imap, imaps, ldap, ldaps, %r(mqtt, )?%rpop3, pop3s, rtsp, scp, sftp, smb, smbs, smtp, smtps, telnet, tftp%r(, ws)?(, wss)?%r
diff --git a/ext/standard/type.c b/ext/standard/type.c
index a228e899046f9..e23e4620da23b 100644
--- a/ext/standard/type.c
+++ b/ext/standard/type.c
@@ -105,7 +105,7 @@ PHP_FUNCTION(settype)
 		convert_to_long(ptr);
 	} else if (zend_string_equals_ci(type, ZSTR_KNOWN(ZEND_STR_FLOAT))) {
 		convert_to_double(ptr);
-	} else if (zend_string_equals_ci(type, ZSTR_KNOWN(ZEND_STR_DOUBLE))) { /* deprecated */
+	} else if (zend_string_equals_ci(type, ZSTR_KNOWN(ZEND_STR_DOUBLE))) {
 		convert_to_double(ptr);
 	} else if (zend_string_equals_ci(type, ZSTR_KNOWN(ZEND_STR_STRING))) {
 		convert_to_string(ptr);
diff --git a/ext/xmlreader/php_xmlreader.c b/ext/xmlreader/php_xmlreader.c
index 27de3a2902850..da337fd6dabb1 100644
--- a/ext/xmlreader/php_xmlreader.c
+++ b/ext/xmlreader/php_xmlreader.c
@@ -755,7 +755,7 @@ PHP_METHOD(XMLReader, moveToAttributeNo)
 }
 /* }}} */
 
-/* {{{ Positions reader at attribute spcified by name and namespaceURI.
+/* {{{ Positions reader at attribute specified by name and namespaceURI.
 Returns TRUE on success and FALSE on failure */
 PHP_METHOD(XMLReader, moveToAttributeNs)
 {
diff --git a/ext/xmlreader/tests/expand.phpt b/ext/xmlreader/tests/expand.phpt
index 9d4545d168972..5244121f6502b 100644
--- a/ext/xmlreader/tests/expand.phpt
+++ b/ext/xmlreader/tests/expand.phpt
@@ -1,5 +1,5 @@
 --TEST--
-XMLReader: Expand into existing DOM documet
+XMLReader: Expand into existing DOM document
 --EXTENSIONS--
 xmlreader
 dom
diff --git a/ext/xmlwriter/php_xmlwriter.c b/ext/xmlwriter/php_xmlwriter.c
index 0c65305c6827d..8d343aadf2637 100644
--- a/ext/xmlwriter/php_xmlwriter.c
+++ b/ext/xmlwriter/php_xmlwriter.c
@@ -432,7 +432,7 @@ PHP_FUNCTION(xmlwriter_write_element)
 }
 /* }}} */
 
-/* {{{ Write full namesapced element tag - returns FALSE on error */
+/* {{{ Write full namespaced element tag - returns FALSE on error */
 PHP_FUNCTION(xmlwriter_write_element_ns)
 {
 	xmlTextWriterPtr ptr;
diff --git a/ext/xmlwriter/tests/bug39504.phpt b/ext/xmlwriter/tests/bug39504.phpt
index 0cb509d37dd5b..eafcd375da93e 100644
--- a/ext/xmlwriter/tests/bug39504.phpt
+++ b/ext/xmlwriter/tests/bug39504.phpt
@@ -1,5 +1,5 @@
 --TEST--
-Bug #39504 (xmlwriter_write_dtd_entity() creates Attlist tag, not enity)
+Bug #39504 (xmlwriter_write_dtd_entity() creates Attlist tag, not entity)
 --EXTENSIONS--
 xmlwriter
 --FILE--
diff --git a/ext/zend_test/observer.c b/ext/zend_test/observer.c
index 85c7d82da0e84..e348987359b91 100644
--- a/ext/zend_test/observer.c
+++ b/ext/zend_test/observer.c
@@ -334,7 +334,8 @@ static ZEND_INI_MH(zend_test_observer_OnUpdateCommaList)
 	}
 	if (stage != PHP_INI_STAGE_STARTUP && stage != PHP_INI_STAGE_ACTIVATE && stage != PHP_INI_STAGE_DEACTIVATE && stage != PHP_INI_STAGE_SHUTDOWN) {
 		ZEND_HASH_FOREACH_STR_KEY(*p, funcname) {
-			if ((func = zend_hash_find_ptr(EG(function_table), funcname))) {
+			if ((func = zend_hash_find_ptr(EG(function_table), funcname))
+					&& RUN_TIME_CACHE(&func->common)) {
 				void *old_handler;
 				zend_observer_remove_begin_handler(func, observer_begin, (zend_observer_fcall_begin_handler *)&old_handler);
 				zend_observer_remove_end_handler(func, observer_end, (zend_observer_fcall_end_handler *)&old_handler);
@@ -357,7 +358,11 @@ static ZEND_INI_MH(zend_test_observer_OnUpdateCommaList)
 		zend_string_release(str);
 		if (stage != PHP_INI_STAGE_STARTUP && stage != PHP_INI_STAGE_ACTIVATE && stage != PHP_INI_STAGE_DEACTIVATE && stage != PHP_INI_STAGE_SHUTDOWN) {
 			ZEND_HASH_FOREACH_STR_KEY(*p, funcname) {
-				if ((func = zend_hash_find_ptr(EG(function_table), funcname))) {
+				if ((func = zend_hash_find_ptr(EG(function_table), funcname))
+						&& RUN_TIME_CACHE(&func->common) && *ZEND_OBSERVER_DATA(func)) {
+					void *old_handler;
+					zend_observer_remove_begin_handler(func, observer_begin, (zend_observer_fcall_begin_handler *)&old_handler);
+					zend_observer_remove_end_handler(func, observer_end, (zend_observer_fcall_end_handler *)&old_handler);
 					zend_observer_add_begin_handler(func, observer_begin);
 					zend_observer_add_end_handler(func, observer_end);
 				}
diff --git a/ext/zend_test/tests/gh16811.phpt b/ext/zend_test/tests/gh16811.phpt
new file mode 100644
index 0000000000000..1b2b8ece9aa1a
--- /dev/null
+++ b/ext/zend_test/tests/gh16811.phpt
@@ -0,0 +1,18 @@
+--TEST--
+GH-16811 (Segmentation fault in zend observer)
+--EXTENSIONS--
+zend_test
+--INI--
+zend_test.observer.enabled=1
+zend_test.observer.show_output=1
+zend_test.observer.observe_function_names=a,d
+--FILE--
+<?php
+var_dump(ini_set("zend_test.observer.observe_function_names", "bar"));
+function d() {}
+?>
+--EXPECTF--
+<!-- init '%s' -->
+<!-- init ini_set() -->
+<!-- init var_dump() -->
+string(3) "a,d"
diff --git a/ext/zend_test/tests/gh16811_observe_all.phpt b/ext/zend_test/tests/gh16811_observe_all.phpt
new file mode 100644
index 0000000000000..466aa0c6d4a4f
--- /dev/null
+++ b/ext/zend_test/tests/gh16811_observe_all.phpt
@@ -0,0 +1,17 @@
+--TEST--
+GH-16811 (Assertion failure adding duplicate observer handler)
+--EXTENSIONS--
+zend_test
+--INI--
+zend_test.observer.enabled=1
+zend_test.observer.observe_all=1
+zend_test.observer.show_output=0
+--FILE--
+<?php
+function foo() {}
+foo();
+ini_set("zend_test.observer.observe_function_names", "foo");
+echo "Done\n";
+?>
+--EXPECT--
+Done
diff --git a/gcovr.cfg b/gcovr.cfg
new file mode 100644
index 0000000000000..a8267cd6e0003
--- /dev/null
+++ b/gcovr.cfg
@@ -0,0 +1,19 @@
+print-summary = yes
+
+exclude-throw-branches = yes
+exclude-unreachable-branches = yes
+
+exclude = ext/bcmath/libbcmath/.*
+exclude = ext/date/lib/.*
+exclude = ext/fileinfo/libmagic/.*
+exclude = ext/gd/libgd/.*
+exclude = ext/hash/sha3/.*
+exclude = ext/lexbor/lexbor/.*
+exclude = ext/mbstring/libmbfl/.*
+exclude = ext/opcache/jit/ir/.*
+exclude = ext/pcre/pcre2lib/.*
+exclude = ext/uri/uriparser/.*
+
+# These patterns have implicit ^/$ anchors.
+exclude-lines-by-pattern = .*\b(ZEND_PARSE_PARAMETERS_(START|END|NONE)|Z_PARAM_).*
+exclude-lines-by-pattern = \s*(default:\s*)?ZEND_UNREACHABLE\(\);\s*