6.1.0270 0= zero-equals CORE

( x -- flag )

flag is true if and only if x is equal to zero.

Testing:

T{        0 0= -> <TRUE>  }T
T{        1 0= -> <FALSE> }T
T{        2 0= -> <FALSE> }T
T{       -1 0= -> <FALSE> }T
T{ MAX-UINT 0= -> <FALSE> }T
T{ MIN-INT  0= -> <FALSE> }T
T{ MAX-INT  0= -> <FALSE> }T

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