[librsvg: 1/3] micro-optimization: use Box slice instead of Vec for Attributes

[Marge Bot <marge-bot src gnome org>]

commit d2c2e539985582e7a06011b4495aa47ebf38747c
Author: Michael Howell <michael notriddle com>
Date:   Wed Jul 6 14:53:13 2022 -0700

    micro-optimization: use Box slice instead of Vec for Attributes
    
    Part of #706
    
    Part-of: <https://gitlab.gnome.org/GNOME/librsvg/-/merge_requests/712>

 src/xml/attributes.rs | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/src/xml/attributes.rs b/src/xml/attributes.rs
index 8afa02d8a..c2c5ac62e 100644
--- a/src/xml/attributes.rs
+++ b/src/xml/attributes.rs
@@ -20,7 +20,7 @@ pub type AttributeValue = DefaultAtom;
 ///
 /// [`new_from_xml2_attributes`]: #method.new_from_xml2_attributes
 #[derive(Clone)]
-pub struct Attributes(Vec<(QualName, AttributeValue)>);
+pub struct Attributes(Box<[(QualName, AttributeValue)]>);
 
 /// Iterator from `Attributes.iter`.
 pub struct AttributesIter<'a>(slice::Iter<'a, (QualName, AttributeValue)>);
@@ -28,7 +28,7 @@ pub struct AttributesIter<'a>(slice::Iter<'a, (QualName, AttributeValue)>);
 impl Attributes {
     #[cfg(test)]
     pub fn new() -> Attributes {
-        Attributes(Vec::new())
+        Attributes([].into())
     }
 
     /// Creates an iterable `Attributes` from the C array of borrowed C strings.
@@ -92,7 +92,7 @@ impl Attributes {
             }
         }
 
-        Attributes(array)
+        Attributes(array.into())
     }
 
     /// Returns the number of attributes.