[WIP][RFC] Add TOML

[Code0x58]

I thought I'd quickly add TOML as an optional dependency to see how it fits in, as the interface is like the usual JSON+YAML load(s)/dump(s). It was easy to drop in TOML as a store for objects, but that's without any mapping to additional types in TOML.

Mapping to TOML types would be nice, as it could allow more generally craftable/ingestable toml files.

I'm thinking there are some options (in order of personal preference):

• do something like update the to_dict(…) single dispatch methods to take something like a for_toml=True kwarg which branches the handling. I'm not sure how this would tie in with to_model other than making the relevant fields fields also handle
• consider it out of scope for related at the moment
• just go with strings as is
  • stay that way and generally lose advantages of TOML
  • change it in a major release (I dislike this a lot because of having to migrate data)

Are there any maintainer/community thoughts on this?

[codecov-io]

Codecov Report

Merging #32 into master will decrease coverage by 0.53%. The diff coverage is 82.35%.

@@            Coverage Diff             @@
##           master      #32      +/-   ##
==========================================
- Coverage   99.81%   99.27%   -0.54%     
==========================================
  Files           9        9              
  Lines         536      553      +17     
==========================================
+ Hits          535      549      +14     
- Misses          1        4       +3

Impacted Files	Coverage Δ
src/related/__init__.py	100% <ø> (ø)	:arrow_up:
src/related/functions.py	97.02% <82.35%> (-2.98%)	:arrow_down:

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Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update 7577a69...fb59c99. Read the comment docs.

[codecov-io]

Codecov Report

Merging #32 into master will decrease coverage by 0.53%. The diff coverage is 82.35%.

@@            Coverage Diff             @@
##           master      #32      +/-   ##
==========================================
- Coverage   99.81%   99.27%   -0.54%     
==========================================
  Files           9        9              
  Lines         536      553      +17     
==========================================
+ Hits          535      549      +14     
- Misses          1        4       +3

Impacted Files	Coverage Δ
src/related/__init__.py	100% <ø> (ø)	:arrow_up:
src/related/functions.py	97.02% <82.35%> (-2.98%)	:arrow_down:

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update 7577a69...15825ac. Read the comment docs.