Edited Issue: $filter=substringof('#', Name) returns 400 bad request [395]

The same issue happens after url encoding:
$filter=substringof('%23', Name)

Respose Content: {"Message":"The query specified in the URI is not valid.","ExceptionMessage":"There is an unterminated string literal at position 13 in 'substringof(''.","ExceptionType":"Microsoft.Data.OData.ODataException","StackTrace":" at Microsoft.Data.OData.Query.ExpressionLexer.NextToken()\r\n at Microsoft.Data.OData.Query.UriQueryExpressionParser.ParseArgumentList(ExpressionTokenKind splitToken)\r\n at Microsoft.Data.OData.Query.UriQueryExpressionParser.ParseIdentifierAsFunction()\r\n at Microsoft.Data.OData.Query.UriQueryExpressionParser.ParseIdentifier()\r\n at Microsoft.Data.OData.Query.UriQueryExpressionParser.ParsePrimaryStart()\r\n at Microsoft.Data.OData.Query.UriQueryExpressionParser.ParsePrimary()\r\n at Microsoft.Data.OData.Query.UriQueryExpressionParser.ParseUnary()\r\n at Microsoft.Data.OData.Query.UriQueryExpressionParser.ParseMultiplicative()\r\n at Microsoft.Data.OData.Query.UriQueryExpressionParser.ParseAdditive()\r\n at Microsoft.Data.OData.Query.UriQueryExpressionParser.ParseComparison()\r\n at Microsoft.Data.OData.Query.UriQueryExpressionParser.ParseLogicalAnd()\r\n at Microsoft.Data.OData.Query.UriQueryExpressionParser.ParseLogicalOr()\r\n at Microsoft.Data.OData.Query.UriQueryExpressionParser.ParseExpression()\r\n at Microsoft.Data.OData.Query.UriQueryExpressionParser.ParseFilter(String filter)\r\n at Microsoft.Data.OData.Query.SyntacticTree.ParseUri(Uri queryUri, Uri serviceBaseUri, Int32 maxDepth)\r\n at Microsoft.Data.OData.Query.SemanticTree.ParseUri(Uri queryUri, Uri serviceBaseUri, IEdmModel model, Int32 maxDepth)\r\n at Microsoft.Data.OData.Query.SemanticTree.ParseUri(Uri queryUri, Uri serviceBaseUri, IEdmModel model)\r\n at System.Web.Http.OData.Query.FilterQueryOption.get_QueryNode() in d:\\dd\\Main.Runtime\\src\\System.Web.Http.OData\\OData\\Query\\FilterQueryOption.cs:line 68\r\n at System.Web.Http.OData.Query.FilterQueryOption.ApplyTo(IQueryable query, Boolean handleNullPropagation, IAssembliesResolver assembliesResolver) in d:\\dd\\Main.Runtime\\src\\System.Web.Http.OData\\OData\\Query\\FilterQueryOption.cs:line 100\r\n at System.Web.Http.OData.Query.ODataQueryOptions.ApplyTo(IQueryable query, Boolean handleNullPropagation, Boolean canUseDefaultOrderBy) in d:\\dd\\Main.Runtime\\src\\System.Web.Http.OData\\OData\\Query\\ODataQueryOptions.cs:line 213\r\n at System.Web.Http.OData.Query.ODataQueryOptions.ApplyTo(IQueryable query, Boolean handleNullPropagation) in d:\\dd\\Main.Runtime\\src\\System.Web.Http.OData\\OData\\Query\\ODataQueryOptions.cs:line 191\r\n at System.Web.Http.OData.Query.ODataQueryOptions.ApplyTo(IQueryable query) in d:\\dd\\Main.Runtime\\src\\System.Web.Http.OData\\OData\\Query\\ODataQueryOptions.cs:line 180\r\n at System.Web.Http.QueryableAttribute.OnActionExecuted(HttpActionExecutedContext actionExecutedContext) in d:\\dd\\Main.Runtime\\src\\System.Web.Http.OData\\QueryableAttribute.cs:line 168"}