merge revision(s) 254bed302752a401b5fcc3b6c65a9c93711d91d6,fad3023e94c45e7f03478732f7641b6f39ba9d12,3156fb0f2c3ebf8229f392c8502c08fe165ab181: [Backport #17218]

	Renamed `nurat_sub` compliant with `rb_rational_plus`

	---
	 internal/rational.h | 1 +
	 rational.c          | 6 +++---
	 2 files changed, 4 insertions(+), 3 deletions(-)

	Fix ArithmeticSequence#last and ArithmeticSequence#each for
	 non-integer sequences (#3870)

	[Bug #17218]
	[ruby-core:100312]
	---
	 common.mk                             |  2 +
	 enumerator.c                          | 99 ++++++++++++++++++++++++++++++++---
	 internal/numeric.h                    |  2 +
	 internal/rational.h                   |  2 +
	 numeric.c                             | 53 ++++++++++---------
	 rational.c                            | 28 +++++++---
	 test/ruby/test_arithmetic_sequence.rb | 10 ++++
	 7 files changed, 156 insertions(+), 40 deletions(-)

	test/ruby/test_arithmetic_sequence.rb: remove a duplicated test

	There is another "test_last_bug17218"
	---
	 test/ruby/test_arithmetic_sequence.rb | 5 -----
	 1 file changed, 5 deletions(-)

1 files changed, 1 insertions, 1 deletions

diff --git a/version.h b/version.h
index 21f37b93dd..c10798ff99 100644
--- a/version.h
+++ b/version.h
@@ -2,7 +2,7 @@
 # define RUBY_VERSION_MINOR RUBY_API_VERSION_MINOR
 #define RUBY_VERSION_TEENY 3
 #define RUBY_RELEASE_DATE RUBY_RELEASE_YEAR_STR"-"RUBY_RELEASE_MONTH_STR"-"RUBY_RELEASE_DAY_STR
-#define RUBY_PATCHLEVEL 172
+#define RUBY_PATCHLEVEL 173
 
 #define RUBY_RELEASE_YEAR 2021
 #define RUBY_RELEASE_MONTH 3