diff --git a/docs/architecture.md b/docs/architecture.md
index ba1931d3..ad5e3f54 100644
--- a/docs/architecture.md
+++ b/docs/architecture.md
@@ -26,23 +26,19 @@ The primary date & time builtins/components are located in the
 These builtins are then reexported from `lib.rs` to be available from
 `temporal_rs`'s root module.
 
-### Core vs. Native
+### Core vs. Compiled
 
 `temporal_rs`'s builtins are split in two distinct directories `core`
-and `native`. The core implementation contains the core implementation
-of the Temporal builtins; meanwhile, the `native` implementation is a
-Rust wrapper around the `core` implementation that simplifies some
-"lower" level date/time API that may not be necessary for a general use
-case.
+and `compiled`. The core implementation contains the core implementation
+of the Temporal builtins; meanwhile, the `compiled` implementation provides
+method wrappers around the `core` methods that simplify some "lower" level
+date/time APIs that may not be necessary for a general use case.
 
 ### Core implementation
 
 The core implementation is always publicly available, but may not be
 available to import from the `temporal_rs`'s root.
 
-The core implementation can be made available from the root by providing
-the `--no-default-features` flag.
-
 The core implementation exposes the Provider API that allows the user to
 supply a "provider", or any type that implements the `TimeZoneProvider`
 trait, for time zone data that the library can use to complete it's
@@ -61,9 +57,9 @@ impl ZonedDateTime {
 }
 ```
 
-### Native implementation
+### Compiled  implementation
 
-The native implementation is only available via the "full" default
+The native implementation is only available via the "compiled" default
 feature flag.
 
 For the same reason that the Provider API is useful for language
diff --git a/src/builtins/compiled/instant.rs b/src/builtins/compiled/instant.rs
index b44e3ea7..0ea8aa9d 100644
--- a/src/builtins/compiled/instant.rs
+++ b/src/builtins/compiled/instant.rs
@@ -9,7 +9,7 @@ impl Instant {
     /// provided options
     ///
     /// Enable with the `compiled_data` feature flag.
-    pub fn as_ixdtf_string(
+    pub fn to_ixdtf_string(
         &self,
         timezone: Option<&TimeZone>,
         options: ToStringRoundingOptions,
@@ -18,6 +18,6 @@ impl Instant {
             .lock()
             .map_err(|_| TemporalError::general("Unable to acquire lock"))?;
 
-        self.as_ixdtf_string_with_provider(timezone, options, &*provider)
+        self.to_ixdtf_string_with_provider(timezone, options, &*provider)
     }
 }
diff --git a/src/builtins/core/instant.rs b/src/builtins/core/instant.rs
index 7fa8a087..7726358a 100644
--- a/src/builtins/core/instant.rs
+++ b/src/builtins/core/instant.rs
@@ -161,10 +161,10 @@ impl Instant {
     }
 
     /// Creates a new `Instant` from the provided Epoch millisecond value.
-    pub fn from_epoch_milliseconds(epoch_milliseconds: i128) -> TemporalResult<Self> {
-        let epoch_nanos = epoch_milliseconds
-            .checked_mul(1_000_000)
-            .unwrap_or(i128::MAX);
+    pub fn from_epoch_milliseconds(epoch_milliseconds: i64) -> TemporalResult<Self> {
+        // Input at most is `i64::MAX`. This means guarantees that the
+        // transition into nanoseconds MUST be in range of `i128`
+        let epoch_nanos = (epoch_milliseconds as i128) * 1_000_000;
         Self::try_new(epoch_nanos)
     }
 
@@ -238,7 +238,7 @@ impl Instant {
 // ==== Instant Provider API ====
 
 impl Instant {
-    pub fn as_ixdtf_string_with_provider(
+    pub fn to_ixdtf_string_with_provider(
         &self,
         timezone: Option<&TimeZone>,
         options: ToStringRoundingOptions,
@@ -629,13 +629,13 @@ mod tests {
         // Assert the to_string is valid.
         let provider = &FsTzdbProvider::default();
         let inst_string = instant
-            .as_ixdtf_string_with_provider(None, ToStringRoundingOptions::default(), provider)
+            .to_ixdtf_string_with_provider(None, ToStringRoundingOptions::default(), provider)
             .unwrap();
         let one_string = one
-            .as_ixdtf_string_with_provider(None, ToStringRoundingOptions::default(), provider)
+            .to_ixdtf_string_with_provider(None, ToStringRoundingOptions::default(), provider)
             .unwrap();
         let two_string = two
-            .as_ixdtf_string_with_provider(None, ToStringRoundingOptions::default(), provider)
+            .to_ixdtf_string_with_provider(None, ToStringRoundingOptions::default(), provider)
             .unwrap();
 
         assert_eq!(&inst_string, "1969-12-25T12:23:45.678901234Z");
diff --git a/src/builtins/core/time.rs b/src/builtins/core/time.rs
index f475d449..349b2d2f 100644
--- a/src/builtins/core/time.rs
+++ b/src/builtins/core/time.rs
@@ -434,7 +434,7 @@ impl PlainTime {
         Ok(Self::new_unchecked(result))
     }
 
-    pub fn as_ixdtf_string(&self, options: ToStringRoundingOptions) -> TemporalResult<String> {
+    pub fn to_ixdtf_string(&self, options: ToStringRoundingOptions) -> TemporalResult<String> {
         let resolved = options.resolve()?;
         let (_, result) = self
             .iso
diff --git a/temporal_capi/src/plain_time.rs b/temporal_capi/src/plain_time.rs
index ae9d9aa7..a20a63b4 100644
--- a/temporal_capi/src/plain_time.rs
+++ b/temporal_capi/src/plain_time.rs
@@ -166,7 +166,7 @@ pub mod ffi {
             write: &mut DiplomatWrite,
         ) -> Result<(), TemporalError> {
             // TODO this double-allocates, an API returning a Writeable or impl Write would be better
-            let string = self.0.as_ixdtf_string(options.into())?;
+            let string = self.0.to_ixdtf_string(options.into())?;
             // throw away the error, the write itself should always succeed
             let _ = write.write_str(&string);