Is `:perm` missing in `IO.write` and `Pathname#write`?

I noticed that the IO.write and Pathname#write method definitions do not have a :perm option.

https://github.com/ruby/rbs/blob/c922491270703787716c022774ad7c8e61db1529/stdlib/builtin/io.rbs#L531

https://github.com/ruby/rbs/blob/c922491270703787716c022774ad7c8e61db1529/stdlib/pathname/pathname.rbs#L1029-L1039

The related IO.write document says:

:perm
integer
Specifies the perm argument for open().

Then, I have the following questions:

• Is there some reason for the missing :perm option?

• Can we unify the common options' definitions? And does it make sense? Like this:

  # IO
  def self.write: (String name, _ToS content, ?Integer offset, ?open_args options) -> Integer
  
  # Pathname
  def write: (String content, ?Integer offset, ?open_args options) -> 
  

See also:

• https://ruby-doc.org/core-2.7.1/IO.html#write-method
• https://ruby-doc.org/stdlib-2.7.1/libdoc/pathname/rdoc/Pathname.html#write-method

Start with stdlib/builtin/io.rbs around line 531 and stdlib/pathname/pathname.rbs around lines 1029-1039, then compare the linked IO and Pathname documentation for their write options. Determine whether :perm is missing and whether the shared options should be represented consistently; done means the signatures and any rationale match the documented APIs.