Remove buffering from builder

ini.go

@@ -9,7 +9,7 @@ import (
 
 // State machine for writing to streamable INI file sources.
 type Builder struct {
-	writer *bufio.Writer
+	writer io.Writer
 }
 
 // Singular key-value pair under the given section within an INI file.
@@ -38,9 +38,11 @@ func (builder *Builder) KeyValue(key string, value string) error {
 }
 
 // Creates and returns a new [Builder] by reference from `writer`.
+//
+// Note that [NewBuilder] does not buffer write operations.
 func NewBuilder(writer io.Writer) *Builder {
 	return &Builder{
-		writer: bufio.NewWriter(writer),
+		writer: writer,
 	}
 }