[pull] master from ruby:master

NEWS.md

@@ -242,7 +242,7 @@ The following bundled gems are updated.
 
 ## Compatibility issues
 
-* The following methods were removed from Ractor due because of `Ractor::Port`:
+* The following methods were removed from Ractor due to the addition of `Ractor::Port`:
 
     * `Ractor.yield`
     * `Ractor#take`

ext/.document

@@ -90,6 +90,7 @@ readline/readline.c
 ripper/lib
 socket
 stringio/stringio.c
+strscan/lib
 strscan/strscan.c
 syslog/syslog.c
 syslog/lib

io_buffer.c

@@ -2231,7 +2231,7 @@ io_buffer_values(int argc, VALUE *argv, VALUE self)
 
 /*
  *  call-seq:
- *    each_byte([offset, [count]]) {|offset, byte| ...} -> self
+ *    each_byte([offset, [count]]) {|byte| ...} -> self
  *    each_byte([offset, [count]]) -> enumerator
  *
  *  Iterates over the buffer, yielding each byte starting from +offset+.
@@ -2255,7 +2255,7 @@ io_buffer_each_byte(int argc, VALUE *argv, VALUE self)
     rb_io_buffer_get_bytes_for_reading(self, &base, &size);
 
     size_t offset, count;
-    io_buffer_extract_offset_count(RB_IO_BUFFER_DATA_TYPE_U8, size, argc-1, argv+1, &offset, &count);
+    io_buffer_extract_offset_count(RB_IO_BUFFER_DATA_TYPE_U8, size, argc, argv, &offset, &count);
 
     for (size_t i = 0; i < count; i++) {
         unsigned char *value = (unsigned char *)base + i + offset;

test/ruby/test_io_buffer.rb

@@ -473,6 +473,7 @@ def test_each_byte
     buffer = IO::Buffer.for(string)
 
     assert_equal string.bytes, buffer.each_byte.to_a
+    assert_equal string.bytes[3, 5], buffer.each_byte(3, 5).to_a
   end
 
   def test_zero_length_each_byte