diff --git a/test/expected/cast.out b/test/expected/cast.out
index ff34c8a..1aba43c 100644
--- a/test/expected/cast.out
+++ b/test/expected/cast.out
@@ -200,6 +200,14 @@ SELECT '{2:1.5,4:3.5}/5'::sparsevec::halfvec(4);
 ERROR:  expected 4 dimensions, not 5
 SELECT '{}/16001'::sparsevec::halfvec;
 ERROR:  halfvec cannot have more than 16000 dimensions
+SELECT '{1:65520}/1'::sparsevec::halfvec;
+ERROR:  "65520" is out of range for type halfvec
+SELECT '{1:1e-8}/1'::sparsevec::halfvec;
+ halfvec 
+---------
+ [0]
+(1 row)
+
 SELECT array_agg(n)::vector FROM generate_series(1, 16001) n;
 ERROR:  vector cannot have more than 16000 dimensions
 SELECT array_to_vector(array_agg(n), 16001, false) FROM generate_series(1, 16001) n;
diff --git a/test/sql/cast.sql b/test/sql/cast.sql
index c5d1d3e..cd2eb3c 100644
--- a/test/sql/cast.sql
+++ b/test/sql/cast.sql
@@ -55,6 +55,8 @@ SELECT '{2:1.5,4:3.5}/5'::sparsevec::halfvec;
 SELECT '{2:1.5,4:3.5}/5'::sparsevec::halfvec(5);
 SELECT '{2:1.5,4:3.5}/5'::sparsevec::halfvec(4);
 SELECT '{}/16001'::sparsevec::halfvec;
+SELECT '{1:65520}/1'::sparsevec::halfvec;
+SELECT '{1:1e-8}/1'::sparsevec::halfvec;
 
 SELECT array_agg(n)::vector FROM generate_series(1, 16001) n;
 SELECT array_to_vector(array_agg(n), 16001, false) FROM generate_series(1, 16001) n;