Why Module.methods() and respond_to? works differently in irb than in script?

Why Module.methods() and respond_to? works differently in irb than in script?

References

Reference NO 1

http://stackoverflow.com/questions/15205952/why-module-methods-and-respond-to-works-differently-in-irb-than-in-script

Reference NO 2

http://stackoverflow.com/questions/17894120/why-are-top-level-methods-handled-differently-in-irb

Reference NO 3

http://stackoverflow.com/questions/5774947/get-all-local-variables-or-available-methods-from-irb

Reference NO 4

http://stackoverflow.com/questions/13874115/why-does-irb-r-make-file-an-absolute-path

Reference NO 5

https://github.com/halhenke/doctor/blob/master/Ruby%20Rails%20notes%20%26%20tips.org

Reference NO 6

#EANF#

Reference NO 7

#EANF#

Reference NO 8

#EANF#