Improve Action View `translate` helper
This disentangles the control flow between Action View's `translate` and I18n's `translate`. In doing so, it fixes a handful of corner cases, for which tests have now been added. It also reduces memory allocations, and improves speed when using a default: **Memory** ```ruby require "benchmark/memory" Benchmark.memory do |x| x.report("warmup") { translate(:"translations.foo"); translate(:"translations.html") } x.report("text") { translate(:"translations.foo") } x.report("html") { translate(:"translations.html") } x.report("text 1 default") { translate(:"translations.missing", default: :"translations.foo") } x.report("html 1 default") { translate(:"translations.missing", default: :"translations.html") } x.report("text 2 defaults") { translate(:"translations.missing", default: [:"translations.missing", :"translations.foo"]) } x.report("html 2 defaults") { translate(:"translations.missing", default: [:"translations.missing", :"translations.html"]) } end ``` Before: ``` text 1.240k memsize ( 0.000 retained) 13.000 objects ( 0.000 retained) 2.000 strings ( 0.000 retained) html 1.600k memsize ( 0.000 retained) 19.000 objects ( 0.000 retained) 2.000 strings ( 0.000 retained) text 1 default 4.728k memsize ( 1.200k retained) 39.000 objects ( 4.000 retained) 5.000 strings ( 0.000 retained) html 1 default 5.056k memsize ( 1.160k retained) 41.000 objects ( 3.000 retained) 4.000 strings ( 0.000 retained) text 2 defaults 7.464k memsize ( 2.392k retained) 54.000 objects ( 6.000 retained) 4.000 strings ( 0.000 retained) html 2 defaults 7.944k memsize ( 2.384k retained) 60.000 objects ( 6.000 retained) 4.000 strings ( 0.000 retained) ``` After: ``` text 952.000 memsize ( 0.000 retained) 9.000 objects ( 0.000 retained) 1.000 strings ( 0.000 retained) html 1.008k memsize ( 0.000 retained) 10.000 objects ( 0.000 retained) 1.000 strings ( 0.000 retained) text 1 default 2.400k memsize ( 40.000 retained) 24.000 objects ( 1.000 retained) 4.000 strings ( 0.000 retained) html 1 default 2.464k memsize ( 0.000 retained) 22.000 objects ( 0.000 retained) 2.000 strings ( 0.000 retained) text 2 defaults 3.232k memsize ( 0.000 retained) 30.000 objects ( 0.000 retained) 2.000 strings ( 0.000 retained) html 2 defaults 3.456k memsize ( 0.000 retained) 32.000 objects ( 0.000 retained) 2.000 strings ( 0.000 retained) ``` **Speed** ```ruby require "benchmark/ips" Benchmark.ips do |x| x.report("text") { translate(:"translations.foo") } x.report("html") { translate(:"translations.html") } x.report("text 1 default") { translate(:"translations.missing", default: :"translations.foo") } x.report("html 1 default") { translate(:"translations.missing", default: :"translations.html") } x.report("text 2 defaults") { translate(:"translations.missing", default: [:"translations.missing", :"translations.foo"]) } x.report("html 2 defaults") { translate(:"translations.missing", default: [:"translations.missing", :"translations.html"]) } end ``` Before: ``` text 35.685k (± 0.7%) i/s - 179.050k in 5.017773s html 28.569k (± 3.1%) i/s - 143.871k in 5.040128s text 1 default 13.953k (± 2.0%) i/s - 70.737k in 5.071651s html 1 default 12.507k (± 0.4%) i/s - 63.546k in 5.080908s text 2 defaults 9.103k (± 0.3%) i/s - 46.308k in 5.087323s html 2 defaults 8.570k (± 4.3%) i/s - 43.071k in 5.034322s ``` After: ``` text 36.694k (± 2.0%) i/s - 186.864k in 5.094367s html 30.415k (± 0.5%) i/s - 152.900k in 5.027226s text 1 default 18.095k (± 2.7%) i/s - 91.086k in 5.036857s html 1 default 15.934k (± 1.7%) i/s - 80.223k in 5.036085s text 2 defaults 12.179k (± 0.6%) i/s - 61.659k in 5.062910s html 2 defaults 11.193k (± 2.1%) i/s - 56.406k in 5.041433s ```
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