As the title says, it would be nice to see trimming and consecutive whitespace merging either as:

• a single normalize option
• two trim and mergeConsecutiveWhitespaces options

in LengthValidator at least, maybe also NotBlank if the checked value is a string

Why? Data should be normalized in general, but there are cases where you'd like to store formatted text with enough useful content, for instance forum posts.

I could do a PR, if you like the suggestion let me know which branch would be the most appropriate since it's a small feature, I guess still 4.1.x?