simplify IsPrefixOf, fixed inheritdoc and updated README

Author: sova

README.md

@@ -85,6 +85,11 @@ Aside from the strict types, the following features are supported for the paths:
 
     (Note how `GetFileNameWithoutExtension()` works nicely together with `GetExtensionWithDot()` to reconstruct the resulting path from their concatenation, however weird the initial name was — no extension, trailing dot, no base name.)
 
+### Unreleased
+
+- `IPath::IsPrefixOf` to check path prefixes.
+- `IPath::StartsWith` to check if the current path starts with a specified path.
+
 Documentation
 -------------
 - [Contributor Guide][docs.contributing]

TruePath/AbsolutePath.cs

@@ -54,14 +54,13 @@ public AbsolutePath(LocalPath localPath) : this(localPath.Value, checkAbsolutene
     /// <inheritdoc cref="IPath.FileName"/>
     public string FileName => Underlying.FileName;
 
-    /// <inheritdoc cref="IPath.StartsWith"/>
+    /// <inheritdoc cref="IPath{TPath}.StartsWith(TPath)"/>
     public bool StartsWith(AbsolutePath other) => Value.StartsWith(other.Value);
 
-    /// <inheritdoc cref="IPath.IsPrefixOf"/>
+    /// <inheritdoc cref="IPath{TPath}.IsPrefixOf(TPath)"/>
     public bool IsPrefixOf(AbsolutePath other)
     {
-        if (!(Value.Length <= other.Value.Length && other.Value.StartsWith(Value))) return false;
-        return other.Value.Length == Value.Length || other.Value[Value.Length] == Path.DirectorySeparatorChar;
+        return Value.Length <= other.Value.Length && other.Value.StartsWith(Value);
     }
 
     /// <summary>

TruePath/LocalPath.cs

@@ -69,10 +69,10 @@ public override int GetHashCode()
         return !left.Equals(right);
     }
 
-    /// <inheritdoc cref="IPath.StartsWith"/>
+    /// <inheritdoc cref="IPath{TPath}.StartsWith(TPath)"/>
     public bool StartsWith(LocalPath other) => Value.StartsWith(other.Value);
 
-    /// <inheritdoc cref="IPath.IsPrefixOf"/>
+    /// <inheritdoc cref="IPath{TPath}.IsPrefixOf(TPath)"/>
     public bool IsPrefixOf(LocalPath other)
     {
         if (!(Value.Length <= other.Value.Length && other.Value.StartsWith(Value))) return false;