save_to_memory function

[shanyj]

hi~
I notice that in pyexcel==0.2.5, save_to_memory function in pyexcel.book.py and pyexcel.sheets.sheet return a StringIo type, However in pyexcel==0.4.0, it returns a str type which make seek() func in my project throw a error.
I am curious about why use str instead of StringIo type?~

Regards
Yj

[chfw]

I am sorry for this surprise. Its implementation was changed without actual specific requirements. I would take this as a regression and restore its functionality. Stay tuned.

[chfw]

Please have a go on it before I release it to pypi .

[shanyj]

thx~

[chfw]

It was found that the stream should have been sought at 0 before returning.

reference: pyexcel-webwares/django-excel#33