Checks whether a value is an integer, should work in Ruby 2.6 and above. (Relies on `Float()` permitting `exception: false`)

is_integer.rb

# Checks whether a value is an integer, should work in Ruby 2.6 and above.
# (Relies on `Float()` permitting `exception: false`: 
# <https://rubyreferences.github.io/rubychanges/2.6.html#numeric-methods-have-exception-argument>)
def is_integer?(val)
  flt = Float(val, exception: false)
  return flt && flt.to_i==flt
end

def is_number?(val)
  return !!Float(val, exception: false)
end