github.com/benhoyt/goawk@v1.8.1/testdata/t.coerce2 (about)

     1  {
     2  	print index(1, $1)
     3  	print substr(123456789, 1, 3)
     4  	print 1 in x
     5  	print 1 23 456
     6  	print 123456789 ~ 123, 123456789 ~ "abc"
     7  }