End of Life Ruby 3.2 has reached end of life and gets no more fixes. 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 *data = NULL;
TypedData_Get_Struct(self, struct rb_io_buffer, &rb_io_buffer_type, data);
return SIZET2NUM(data->size);
}