feat: flat tweaks and string interning

Co-authored-by: rvcas <x@rvcas.dev>

crates/flat/src/decode.rs

@@ -44,7 +44,7 @@ impl Decode<'_> for char {
 
 impl Decode<'_> for String {
     fn decode(d: &mut Decoder) -> Result<Self, String> {
-        d.string()
+        d.utf8()
     }
 }
 

crates/flat/src/decoder.rs

@@ -51,6 +51,11 @@ impl<'b> Decoder<'b> {
         Ok(s)
     }
 
+    pub fn utf8(&mut self) -> Result<String, String> {
+        // TODO: Better Error Handling
+        Ok(String::from_utf8(Vec::<u8>::decode(self)?).unwrap())
+    }
+
     pub fn filler(&mut self) -> Result<(), String> {
         while self.zero()? {}
         Ok(())

crates/flat/src/encode.rs

@@ -46,7 +46,7 @@ impl Encode for char {
 
 impl Encode for &str {
     fn encode(&self, e: &mut Encoder) -> Result<(), String> {
-        e.string(*self)?;
+        e.utf8(self)?;
 
         Ok(())
     }
@@ -54,7 +54,7 @@ impl Encode for &str {
 
 impl Encode for String {
     fn encode(&self, e: &mut Encoder) -> Result<(), String> {
-        e.string(self)?;
+        e.utf8(self)?;
 
         Ok(())
     }

crates/flat/src/encoder.rs

@@ -75,7 +75,7 @@ impl Encoder {
         self.word(c as usize);
         Ok(self)
     }
-
+    // TODO: Do we need this?
     pub fn string(&mut self, s: &str) -> Result<&mut Self, String> {
         for i in s.chars() {
             self.one();
@@ -87,6 +87,10 @@ impl Encoder {
         Ok(self)
     }
 
+    pub fn utf8(&mut self, s: &str) -> Result<&mut Self, String> {
+        self.bytes(s.as_bytes())
+    }
+
     fn zero(&mut self) {
         if self.used_bits == 7 {
             self.next_word();