I think it's pretty reasonable to interpret "Language X promises Y" as tantamount to said promise appearing in Language X's definition and/or docs. Claims from devs in their official capacities are likely to count as well.
On the other hand, what effectively random third parties say doesn't matter all that much IMO when it comes to these things because what they think a language promises has little to no bearing on what the language actually promises. If I find a bunch of randos claiming Rust promises to give me a unicorn for my birthday it seems rather nonsensical to turn around and criticize Rust for not actually giving me a unicorn in my birthday.
alt Hacker News
I think it's pretty reasonable to interpret "Language X promises Y" as tantamount to said promise appearing in Language X's definition and/or docs. Claims from devs in their official capacities are likely to count as well.
On the other hand, what effectively random third parties say doesn't matter all that much IMO when it comes to these things because what they think a language promises has little to no bearing on what the language actually promises. If I find a bunch of randos claiming Rust promises to give me a unicorn for my birthday it seems rather nonsensical to turn around and criticize Rust for not actually giving me a unicorn in my birthday.