feat: Allow nullable expiry per 0.9.0 spec. Fixes #23

[jsantell]

No description provided.

[codecov-commenter]

Codecov Report

Merging #95 (382219a) into main (3d30ec8) will increase coverage by 0.15%.
The diff coverage is 88.88%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #95      +/-   ##
==========================================
+ Coverage   57.10%   57.26%   +0.15%     
==========================================
  Files          24       24              
  Lines         802      805       +3     
  Branches      196      197       +1     
==========================================
+ Hits          458      461       +3     
  Misses        206      206              
  Partials      138      138              

Impacted Files	Coverage Δ
ucan/src/chain.rs	61.90% <ø> (ø)
ucan/src/ipld/ucan.rs	71.11% <ø> (ø)
ucan/src/ucan.rs	68.04% <75.00%> (-0.78%)	⬇️
ucan/src/builder.rs	80.80% <100.00%> (+1.80%)	⬆️

[jsantell]

Updated to not encode expiry if empty per canonicalization

[jsantell]

Updated to not encode expiry if empty per canonicalization

Stepping back from this. The exp field is both required and nullable. Per canonicalization, optional fields MUST not be encoded e.g. fct and prf. exp was explicitly made NOT optional due to safety concerns, so to adhere to canonicalization, we should encode empty exp fields as Null.

[cdata]

Looks good, just a request for some coverage 🙏

[jsantell]

Broke out tests into two: one for serialization without optionals (covers and clarifies these collection of PRs with optionality changes), and one specifically for lifetime_ends_after(), adding a case for the missing (Some, Some) scenario

[cdata]