Merge branch 'master' of https://gitbox.apache.org/repos/asf/commons-io.git

Author: garydgregory

src/changes/changes.xml

@@ -55,6 +55,7 @@ The <action> type attribute can be add,update,fix,remove.
       <action dev="ggregory" type="fix" issue="IO-860" due-to="Stefan Feenstra, Gary Gregory">Missing reserved file names in FileSystem.WINDOWS (superscript digits for COM and LPT).</action>
       <action dev="ggregory" type="fix" issue="IO-856" due-to="Thomas Hartwig, Gary Gregory">FileUtils.listFiles(final File, String[], boolean) can throw NoSuchFileException #697, #699.</action>
       <action dev="ggregory" type="fix" issue="IO-859" due-to="JD Dean, Gary Gregory">FileUtils.forceDelete on non-existent file on Windows throws IOException rather than FileNotFoundException.</action>
+      <action dev="ggregory" type="fix"                due-to="Éamonn McManus">Use Unicode escapes for superscript characters. #701.</action> 
       <!-- ADD -->
       <action dev="ggregory" type="add"                due-to="Gary Gregory">Add @FunctionalInterface to ClassNameMatcher.</action>
       <action dev="ggregory" type="add"                due-to="Gary Gregory">Add ValidatingObjectInputStream.Builder and ValidatingObjectInputStream.builder().</action>

src/main/java/org/apache/commons/io/FileSystem.java

@@ -90,10 +90,10 @@ public enum FileSystem {
             }, new String[] {
                     "AUX",
                     "COM1", "COM2", "COM3", "COM4", "COM5", "COM6", "COM7", "COM8", "COM9",
-                    "COM²", "COM³", "COM¹", // Yes, that's the order in Unicode
+                    "COM\u00b2", "COM\u00b3", "COM\u00b9", // Superscript 2 3 1 in that order
                     "CON", "CONIN$", "CONOUT$",
                     "LPT1", "LPT2", "LPT3", "LPT4", "LPT5", "LPT6", "LPT7", "LPT8", "LPT9",
-                    "LPT²", "LPT³", "LPT¹", // Yes, that's the order in Unicode
+                    "LPT\u00b2", "LPT\u00b3", "LPT\u00b9", // Superscript 2 3 1 in that order
                     "NUL", "PRN"
             }, true, true, '\\');
     // @formatter:on