feat: clearify the ruby std lib

Author: initdc

.rubocop.yml

@@ -1,5 +1,6 @@
 AllCops:
-  TargetRubyVersion: 2.6
+  TargetRubyVersion: 2.7
+  DefaultFormatter: simple
 
 Style/StringLiterals:
   Enabled: true

Gemfile.lock

@@ -0,0 +1,63 @@
+PATH
+  remote: .
+  specs:
+    cr-exec (0.1.0)
+
+GEM
+  remote: https://rubygems.org/
+  specs:
+    ast (2.4.2)
+    diff-lcs (1.5.1)
+    json (2.7.2)
+    language_server-protocol (3.17.0.3)
+    parallel (1.25.1)
+    parser (3.3.3.0)
+      ast (~> 2.4.1)
+      racc
+    racc (1.8.0)
+    rainbow (3.1.1)
+    rake (13.2.1)
+    regexp_parser (2.9.2)
+    rexml (3.3.1)
+      strscan
+    rspec (3.13.0)
+      rspec-core (~> 3.13.0)
+      rspec-expectations (~> 3.13.0)
+      rspec-mocks (~> 3.13.0)
+    rspec-core (3.13.0)
+      rspec-support (~> 3.13.0)
+    rspec-expectations (3.13.1)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.13.0)
+    rspec-mocks (3.13.1)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.13.0)
+    rspec-support (3.13.1)
+    rubocop (1.64.1)
+      json (~> 2.3)
+      language_server-protocol (>= 3.17.0)
+      parallel (~> 1.10)
+      parser (>= 3.3.0.2)
+      rainbow (>= 2.2.2, < 4.0)
+      regexp_parser (>= 1.8, < 3.0)
+      rexml (>= 3.2.5, < 4.0)
+      rubocop-ast (>= 1.31.1, < 2.0)
+      ruby-progressbar (~> 1.7)
+      unicode-display_width (>= 2.4.0, < 3.0)
+    rubocop-ast (1.31.3)
+      parser (>= 3.3.1.0)
+    ruby-progressbar (1.13.0)
+    strscan (3.1.0)
+    unicode-display_width (2.5.0)
+
+PLATFORMS
+  x86_64-linux
+
+DEPENDENCIES
+  cr-exec!
+  rake (~> 13.0)
+  rspec (~> 3.0)
+  rubocop (~> 1.21)
+
+BUNDLED WITH
+   2.3.5