Question whether a variable is type_integer
type:integer?($variable) : BOOL
type:integer?(1) #=> true
type:integer?(-1) #=> true
type:integer?(0) #=> true
type:integer?(null) #=> false
type:integer?(0.0) #=> false
type:integer?(10.0) #=> false
type:integer?('10') #=> false
type:integer?(10.2) #=> false
type:integer?('10.2') #=> false
type:integer?(true) #=> false
type:integer?(false) #=> false
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