value and toExternalString... deprecated?
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Description
Is `toExternalString` deprecated?
`Serialization` package seems to be a newer solution to "pickling"... but it is not mentioned by `help toExternalString`.
It seems that to be able to pickle and unpickle a matrix (with `toExternalString`) one needs to have the ring and its generators as global variables, otherwise...
```
i1 : QQ[x]
o1 = QQ[x]
o1 : PolynomialRing
i2 : toExternalString matrix{{x}}
o2 = map((QQ[x])^1,(QQ[x])^{{-1}},{{x}})
i3 : value oo
currentString:1:1:(3):[1]: error: modules over incompatible rings
currentString:1:1:(3):[1]: --entering debugger (type help to see debugger commands)
currentString:1:1-1:32: --source code:
map((QQ[x])^1,(QQ[x])^{{-1}},{{x}})
```
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Research direction
Start by reproducing the shown `toExternalString` and `value` session, then compare the `toExternalString` help output with the `Serialization` package documentation. No source files or tests are named; done means the deprecation status and the matrix round-trip behavior are clearly resolved or documented.
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Assessment
- Domain
- tooling
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Quiet
- Clarity
- Needs clarification
- Newbie friendliness
- 35/100