Maintenance Ruby 3.3 gets fixes, but no new features. Switch to Ruby 4.0 →
instance method
IO::Buffer#size
size → integer
io_buffer.c
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VALUE
rb_io_buffer_size(VALUE self)
{
struct rb_io_buffer *buffer = NULL;
TypedData_Get_Struct(self, struct rb_io_buffer, &rb_io_buffer_type, buffer);
return SIZET2NUM(buffer->size);
}