Fix primes_of_bounded_norm for noninteger entries

Author: Eloitor

src/sage/rings/number_field/number_field.py

@@ -3932,6 +3932,8 @@ def primes_of_bounded_norm(self, B):
              Fractional ideal (3)]
             sage: K.primes_of_bounded_norm(1)
             []
+            sage: K.primes_of_bounded_norm(1.1)
+            []
             sage: x = polygen(QQ, 'x')
             sage: K.<a> = NumberField(x^3 - 2)
             sage: P = K.primes_of_bounded_norm(30)
@@ -3951,7 +3953,7 @@ def primes_of_bounded_norm(self, B):
             B = ZZ(B)
         except (TypeError, AttributeError):
             try:
-                B = ZZ(B.ceil())
+                B = ZZ(B.floor())
             except (TypeError, AttributeError):
                 raise TypeError("%s is not valid bound on prime ideals" % B)
         if B < 2: