Colin B. Macdonald comments

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                                            Colin B. Macdonald

Makefile: Compute and display SHA-256 of tarballs in `make release`

Sounds good but I'm not sure how much of the `pkg install -forge` routines use md5 and those are still in use back to Octave 4 or something like that....

[WIP] Add 2D sym functions and use them.

I force-pushed this onto top of the latest Array_not_Matrix

[WIP] Add 2D sym functions and use them.

I cherry-picked a one of the commits out of here into #1194.

Array_not_Matrix: uniop_bool_helper may not work with Array

Related upstream question: https://github.com/sympy/sympy/issues/24008

Array_not_Matrix: uniop_bool_helper may not work with Array

Based on upstream comments, we should assume that `.applyfunc` would return a TypeError or similar if it produces something that cannot go back into a matrix. I guess we catch...

Matrix: what is supposed to happen if you applyfunc yourself out of the domain?

Yeah I'm pretty familiar with #23305 :)

Should linear indexing of Array behave like Matrix?

Ok, so it is documented so I guess my question becomes: is it true that `Array` is NOT supposed to linear index in this fashion? Perhaps I can read and...

Should linear indexing of Array behave like Matrix?

I think I agree. Maybe a round of deprecation for linear indexing into Matrix is a good idea.

Should linear indexing of Array behave like Matrix?

Not sure this is relevant but somewhat related is the behaviour of `len` on Array: ``` A = Array(range(10,16), shape=(2,3)) ⎡10 11 12⎤ ⎢ ⎥ ⎣13 14 15⎦ >>> len(A)...

Non-Expr objects in a Matrix are deprecated

### related issues to address before deprecation becomes error - [ ] #24008 - [ ] #23305 ### tracker issues for downstream projects porting efforts - [ ] https://github.com/cbm755/octsympy/issues/1124 (feel...