Use Symbol#name to minimize memory allocation

[skryukov]

Ruby 3.0 introduced the Symbol#name method that acts as Symbol#to_s but returns a frozen string, we can utilize this method to reduce number of objects Alba creates during serialization.

BEFORE (no YJIT, no Oj):

IPS:

Comparison:
               panko:      692.4 i/s
alba_with_transformation:      276.5 i/s - 2.50x  slower
                alba:      240.7 i/s - 2.88x  slower
         alba_inline:       75.1 i/s - 9.21x  slower

MEMORY:

Comparison:
               panko:     259178 allocated
alba_with_transformation:     650141 allocated - 2.51x more
                alba:     826201 allocated - 3.19x more
         alba_inline:    2711921 allocated - 10.46x more

AFTER (no YJIT, no Oj):

IPS:

Comparison:
               panko:      668.5 i/s
alba_with_transformation:      276.8 i/s - 2.42x  slower
                alba:      264.6 i/s - 2.53x  slower
         alba_inline:       74.4 i/s - 8.99x  slower

MEMORY:

Comparison:
               panko:     259178 allocated
alba_with_transformation:     650141 allocated - 2.51x more
                alba:     650201 allocated - 2.51x more
         alba_inline:    2535921 allocated - 9.78x more

[skryukov]

One thing I noticed is that we do test for UserResource.new(@user).serialize(root_key: true), but this line raises an error with Alba.symbolize_keys!.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.83%. Comparing base (22eb21f) to head (d2edf21).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #405   +/-   ##
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  Coverage   99.83%   99.83%           
=======================================
  Files          14       14           
  Lines         599      600    +1     
  Branches      153      154    +1     
=======================================
+ Hits          598      599    +1     
  Misses          1        1           

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[okuramasafumi]

Wow I think I knew name method, but did not know it makes such a big difference, thank you!