Stefan Monnier wrote:
>> Is there a major downside to using `cl-defstruct` to define a stream?
> 
> Probably not major, no.  Beware: it'll come with several upsides, tho.
> 
> 
>          Stefan
> 

Hello,

Please see the attached file. It changes streams to be structs, warns 
that streams are not mutable, adds a creation method for arrays that 
doesn't create intermediate sub-arrays, and adds some methods for 
streams for more of the seq.el functions.

Please let me know what you would like changed.

Thank you.