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https://crystal-lang.org/api/1.19.1/Nil.html
Nil - Crystal 1.19.1
crystal 1 19nil
https://crystal-lang.org/api/1.19.1/YAML.html
YAML - Crystal 1.19.1
crystal 1 19yaml
https://crystal-lang.org/api/1.19.1/String.html
String - Crystal 1.19.1
crystal 1 19string
https://crystal-lang.org/api/1.19.1/Bool.html
Bool - Crystal 1.19.1
crystal 1 19bool
https://crystal-lang.org/api/1.19.1/IO.html
IO - Crystal 1.19.1
crystal 1 19io