Switch from (...).into() to Self(...)

Although it introduces some nesting, I think it's an overall improvement to clarity.

src/nucleotide.rs

@@ -438,7 +438,7 @@ impl CodonAmbiguous {
 impl From<Codon> for CodonAmbiguous {
     #[inline(always)]
     fn from(codon: Codon) -> Self {
-        codon.0.map(Into::into).into()
+        Self(codon.0.map(Into::into))
     }
 }
 
@@ -448,7 +448,7 @@ impl TryFrom<CodonAmbiguous> for Codon {
     #[inline(always)]
     fn try_from(codon: CodonAmbiguous) -> Result<Self, Self::Error> {
         let [nuc0, nuc1, nuc2] = codon.0.map(TryInto::try_into);
-        Ok([nuc0?, nuc1?, nuc2?].into())
+        Ok(Self([nuc0?, nuc1?, nuc2?]))
     }
 }