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# ::escape()
# ::escape() does not escape special values
 -  returns null if the value to escape is null
 -  returns false if the value to escape is false
 -  returns true if the value to escape is true
# ::escape() does not escape a value when escaping method is ESC_RAW
 -  takes an escaping strategy function name as its first argument
# ::escape() escapes strings
 -  returns an escaped string if the value to escape is a string
 -  returns an escaped string if the value to escape is a string
# ::escape() escapes arrays
 -  returns a sfOutputEscaperArrayDecorator object if the value to escape is an array
 -  escapes all elements of the original array
 -  is recursive
 -  returns the unescaped value
# ::escape() escapes objects
 -  returns a sfOutputEscaperObjectDecorator object if the value to escape is an object
 -  escapes all methods of the original object
 -  escapes all properties of the original object
 -  is recursive
 -  returns the unescaped value
 -  does not double escape an object
 -  returns a sfOutputEscaperIteratorDecorator object if the value to escape is an object that implements the ArrayAccess interface
# ::escape() does not escape object marked as being safe
 -  returns the original value if it is marked as being safe
 -  returns the original value if the object class is marked as being safe
 -  returns the original value if one of the object parent class is marked as being safe
# ::escape() cannot escape resources
 -  throws an InvalidArgumentException if the value cannot be escaped
# ::unescape()
# ::unescape() does not unescape special values
 -  returns null if the value to unescape is null
 -  returns false if the value to unescape is false
 -  returns true if the value to unescape is true
# ::unescape() unescapes strings
 -  returns an unescaped string if the value to unescape is a string
 -  returns an unescaped string if the value to unescape is a string
# ::unescape() unescapes arrays
 -  returns an array if the input is a sfOutputEscaperArrayDecorator object
 -  unescapes all elements of the original array
 -  is recursive
# ::unescape() unescapes objects
 -  returns the original object when a sfOutputEscaperObjectDecorator object is passed
 -  unescapes all methods of the original object
 -  unescapes all properties of the original object
 -  is recursive
 -  unescapes sfOutputEscaperIteratorDecorator objects
# ::unescape() does not unescape object marked as being safe
 -  returns the original value if it is marked as being safe
 -  returns the original value if the object class is marked as being safe
 -  returns the original value if one of the object parent class is marked as being safe
# ::unescape() do nothing to resources
 -  do nothing to resources
# ::unescape() unescapes mixed arrays
 -  unescapes values with some escaped and unescaped values
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