Fix reading/writing bigint and bigdecimal (#2893)

crates/nu-protocol/src/value/serde_bigdecimal.rs

@@ -1,18 +1,11 @@
 use bigdecimal::BigDecimal;
-use num_traits::cast::FromPrimitive;
-use num_traits::cast::ToPrimitive;
 
 /// Enable big decimal serialization by providing a `serialize` function
 pub fn serialize<S>(big_decimal: &BigDecimal, serializer: S) -> Result<S::Ok, S::Error>
 where
     S: serde::Serializer,
 {
-    serde::Serialize::serialize(
-        &big_decimal
-            .to_f64()
-            .ok_or_else(|| serde::ser::Error::custom("expected a f64-sized bignum"))?,
-        serializer,
-    )
+    serde::Serialize::serialize(&big_decimal.to_string(), serializer)
 }
 
 /// Enable big decimal deserialization by providing a `deserialize` function
@@ -20,7 +13,7 @@ pub fn deserialize<'de, D>(deserializer: D) -> Result<BigDecimal, D::Error>
 where
     D: serde::Deserializer<'de>,
 {
-    let x: f64 = serde::Deserialize::deserialize(deserializer)?;
-    Ok(BigDecimal::from_f64(x)
-        .ok_or_else(|| serde::de::Error::custom("expected a f64-sized bigdecimal"))?)
+    let x: String = serde::Deserialize::deserialize(deserializer)?;
+    Ok(BigDecimal::parse_bytes(x.as_bytes(), 10)
+        .ok_or_else(|| serde::de::Error::custom("expected a bigdecimal"))?)
 }

crates/nu-protocol/src/value/serde_bigint.rs

@@ -1,18 +1,11 @@
 use num_bigint::BigInt;
-use num_traits::cast::FromPrimitive;
-use num_traits::cast::ToPrimitive;
 
 /// Enable big int serialization by providing a `serialize` function
 pub fn serialize<S>(big_int: &BigInt, serializer: S) -> Result<S::Ok, S::Error>
 where
     S: serde::Serializer,
 {
-    serde::Serialize::serialize(
-        &big_int
-            .to_i64()
-            .ok_or_else(|| serde::ser::Error::custom("expected a i64-sized bignum"))?,
-        serializer,
-    )
+    serde::Serialize::serialize(&big_int.to_string(), serializer)
 }
 
 /// Enable big int deserialization by providing a `deserialize` function
@@ -20,7 +13,8 @@ pub fn deserialize<'de, D>(deserializer: D) -> Result<BigInt, D::Error>
 where
     D: serde::Deserializer<'de>,
 {
-    let x: i64 = serde::Deserialize::deserialize(deserializer)?;
-    Ok(BigInt::from_i64(x)
-        .ok_or_else(|| serde::de::Error::custom("expected a i64-sized bignum"))?)
+    let x: String = serde::Deserialize::deserialize(deserializer)?;
+
+    Ok(BigInt::parse_bytes(x.as_bytes(), 10)
+        .ok_or_else(|| serde::de::Error::custom("expected a bignum"))?)
 }

tests/shell/pipeline/commands/internal.rs

@@ -332,6 +332,30 @@ fn string_interpolation_with_it_column_path() {
     assert_eq!(actual.out, "sammie");
 }
 
+#[test]
+fn bignum_large_integer() {
+    let actual = nu!(
+        cwd: ".",
+        r#"
+            echo 91231720741731287123917
+        "#
+    );
+
+    assert_eq!(actual.out, "91231720741731287123917");
+}
+
+#[test]
+fn bignum_large_decimal() {
+    let actual = nu!(
+        cwd: ".",
+        r#"
+            echo 91231720741731287123917.1
+        "#
+    );
+
+    assert_eq!(actual.out, "91231720741731287123917.1");
+}
+
 #[test]
 fn run_custom_command() {
     let actual = nu!(