Improve curry performances

[nlepage]

Issue : fix #316

[codecov-io]

Codecov Report

Merging #317 into dev will increase coverage by 0.35%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##              dev     #317      +/-   ##
==========================================
+ Coverage   96.81%   97.17%   +0.35%     
==========================================
  Files         107      107              
  Lines         377      425      +48     
==========================================
+ Hits          365      413      +48     
  Misses         12       12

Impacted Files	Coverage Δ
packages/immutadot/src/core/curry.js	100% <100%> (ø)	⬆️
packages/immutadot/src/core/apply.js	59.09% <100%> (ø)	⬆️

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[nlepage]

Some explanation:
fixedArity's only purpose is performance.
It might or might not truncate extra arguments.
So no assumption should be made on whether extra arguments will or will not be truncated.
To be honest, I tried implementing a consistent behavior (truncating args when fixedArity is true and all args are sent at once, using args.slice(0, arity)), but it had significant impact on performance...

[nlepage]

Results here: #299 (comment)