tools.cli/parse-opts接受参数、选项规范和附加选项。它调用compile-option-specs和required-arguments来构建specs和req。然后它使用这些规范和req在提供的args（连同选项）上执行验证。对于给定应用程序，前两个步骤在整个调用期间都不会改变。
我提议一个新的函数make-parse-opts-fn，该函数在预先执行compile-option-specs和required-arguments操作，并返回一个依赖于编译的specs和req的函数。它可以这样使用：(def compiled-parser (make-parse-opts-fn cli-options))。
使用criterium进行微基准测试表明速度提高了超过两倍（首先是tools.cli/parse-opts，然后是预编译的解析器）
; user=> (def cli-options
[["-h" "--help" "This message"]
[nil "--extra" "Output in extra format"
:default false]
["-q" "--quiet" "Print no suggestions, only return exit code"
:default false]])
#'user/cli-options
; user=> (bench (cli/parse-opts ["--quiet" "src"] cli-options :in-order true))
Evaluation count : 10962 in 6 samples of 1827 calls.
Execution time mean : 65.021329 µs
Execution time std-deviation : 5.276033 µs
Execution time lower quantile : 58.658638 µs ( 2.5%)
Execution time upper quantile : 69.724228 µs (97.5%)
Overhead used : 9.607933 ns
nil
; user=> (bench (compiled-parser ["--quiet" "src"] :in-order true))
Evaluation count : 24660 in 6 samples of 4110 calls.
Execution time mean : 25.090846 µs
Execution time std-deviation : 253.361821 ns
Execution time lower quantile : 24.769079 µs ( 2.5%)
Execution time upper quantile : 25.413286 µs (97.5%)
Overhead used : 9.607933 ns
nil
如果也将附加选项提升到make-parse-opts-fn中（以速度换取灵活性），那么差异将更加显著，比现有的tools.cli/parse-opts函数快大约10倍
; user=> (bench (compiled-parser-2 ["--quiet" "src"]))
Evaluation count : 73116 in 6 samples of 12186 calls.
Execution time mean : 8.349923 µs
Execution time std-deviation : 51.419864 ns
Execution time lower quantile : 8.282266 µs ( 2.5%)
Execution time upper quantile : 8.407998 µs (97.5%)
Overhead used : 9.607933 ns
Found 2 outliers in 6 samples (33.3333 %)
low-severe 1 (16.6667 %)
low-mild 1 (16.6667 %)
Variance from outliers : 13.8889 % Variance is moderately inflated by outliers
nil
如果对此感兴趣，我可以提供一个补丁。
