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narrow
Combined from primary sources listed below.

In role Numeric§

See primary documentation in context for method narrow 

method narrow(Numeric:D --> Numeric:D)

Returns the number converted to the narrowest type that can hold it without loss of precision.

say (4.0 + 0i).narrow.raku;     # OUTPUT: «4␤»
say (4.0 + 0i).narrow.^name;    # OUTPUT: «Int␤»