Fix/issue 500

[VictorKoenders]

• Fixed an issue where serde would decode a sequence with an u32 instead of a usize
• Added serde to the the_same test for roundtrips, fixed several issues.
• Fixed backwards compatibility for result, ipv4addr and ipv6addr

[codecov]

Codecov Report

Merging #503 (e1f2cdd) into trunk (3127ff5) will increase coverage by 1.62%.
The diff coverage is 78.43%.

❗ Current head e1f2cdd differs from pull request most recent head a575ed9. Consider uploading reports for the commit a575ed9 to get more accurate results

@@            Coverage Diff             @@
##            trunk     #503      +/-   ##
==========================================
+ Coverage   69.09%   70.72%   +1.62%     
==========================================
  Files          44       46       +2     
  Lines        3058     3149      +91     
==========================================
+ Hits         2113     2227     +114     
+ Misses        945      922      -23     

Impacted Files	Coverage Δ
src/config.rs	90.47% <ø> (ø)
src/features/serde/mod.rs	33.33% <ø> (-1.67%)	⬇️
tests/alloc.rs	98.33% <ø> (-0.06%)	⬇️
src/features/serde/de_borrowed.rs	22.10% <25.00%> (+0.12%)	⬆️
src/features/serde/ser.rs	69.10% <53.33%> (+35.14%)	⬆️
src/features/serde/de_owned.rs	72.86% <53.84%> (+30.41%)	⬆️
tests/utils.rs	37.17% <69.23%> (+5.36%)	⬆️
tests/serde.rs	96.42% <88.88%> (-1.54%)	⬇️
compatibility/src/lib.rs	51.78% <100.00%> (+0.87%)	⬆️
compatibility/src/misc.rs	100.00% <100.00%> (ø)
... and 15 more

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[Stargateur]

This make using serde with config::standard not a thing

#506

[VictorKoenders]

We decided to make .write_fixed_array_header the default for config::standard(): #509