> How often do you feel that changes in Sage breaks your code? 

Looking at my log (this project 
https://github.com/defeo/ss-isogeny-software)

- Sage 6.2: module renamed in Pari/GP interface (without deprecation, as 
far as I recall)
- Sage 6.4: frankly, I don't know, but possibly a change in the finite 
fields implementation
- Sage 6.7: changes in cython, not really Sage's fault, I guess
- Sage 6.7: changes in the finite fields implementation (with proper 
deprecation, this time)
- Sage 6.10: changes in richcmp (did not get deprecation warnings, but the 
change concerns an internal function)
- Sage 7.1: affected by #19941 (properly deprecated, note that 7.1 is 
stable right now, but not yet in SMC)

It may be argued that I'm taking risks because I sometimes fiddle with "the 
internals" of Sage, but one other problem of Sage is that it does not 
define clearly what's the public API and what's internal.

Luca

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