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Wouldn't've what ?

See, it's a word!

I Googled it:
"Wouldn't've" is a valid double contraction for "would not have" used primarily in spoken English and informal writing. It represents a casual, rapid pronunciation rather than formal written style. While it accurately reflects speech, it is generally considered non-standard and should be avoided in formal writing

So when I wrote it in my formal proposal, I shouldn't've?

It's Google time:
A formal proposal is a structured document designed to persuade a decision-maker to approve a project, purchase a service, or adopt an idea. It must be professional, clear, and informative, often tailored to solve a specific problem or meet a need.

I would have to look that up ...

Bing ... weren't you on another meme today ?