SPIFlashFileSystem open file handle

Libraries
4

this one seems to be doing all it should.
Any chance this might end up in the standard lib ? overhead is pretty small (just an array with pointers to the opened files).

class ExtSPIFlashFileSystem extends SPIFlashFileSystem
{
	_openFileHandles = null;

	constructor(start = null, end = null, flash = null) 
	{
		_openFileHandles = {};
		base.constructor(start, end , flash );
	}

	function open(fname, mode) 
	{
		if (!(fname in _openFileHandles))
		{
			local handle = base.open(fname,mode);
			_openFileHandles[fname] <- handle;
		}
		return _openFileHandles[fname];
	}

	function getFileHandle(fname)
	{
		if (fname in _openFileHandles)
			return _openFileHandles[fname];
		return null;
	}

 	function _close(fileId, fileIdx, dirty) 
 	{
 		base._close(fileId, fileIdx, dirty);
 		foreach(file in getFileList())
 		{
 			if (file.id == fileId)
 			{
 				delete _openFileHandles[file.fname];
 			}
 		}
 	}
}