Typst 0.13 compatibility: Fix 1 more error and 2 warnings (#54)

* Fix another "Cannot add type and string"

* Fix warning "Unnecessary import rename to same name"

* Fix warning "Unnecessary import rename to same name"

Author: eltos

src/assertions.typ

@@ -1,4 +1,4 @@
-#import "./assertions/length.typ" as length
+#import "./assertions/length.typ"
 #import "./assertions/comparative.typ": min, max, eq, neq
 #import "./assertions/string.typ": *
 
@@ -9,4 +9,4 @@
     list.contains(it)
   },
   message: (self, it) => "Unknown " + self.name + " `" + repr(it) + "`",
-)
+)

src/base-type.typ

@@ -48,7 +48,7 @@
           message: "Expected " + self.types.map(repr).join(
             ", ",
             last: " or ",
-          ) + ". Got " + type(it),
+          ) + ". Got " + str(type(it)),
         )
         return false
       }

src/lib.typ

@@ -4,7 +4,7 @@
 #import "assertions-util.typ" as advanced
 #import "assertions.typ" as assert
 #import "coercions.typ" as coerce
-#import "schemas.typ" as schemas
+#import "schemas.typ"
 
 #let parse(
   object,