Refactor formula functions and values

[HactarCE]

This refactor will enable better Excel compatibility in formula evaluation:

Arrays

• Independent horizontal & vertical expansion ({1,2,3} + {10;20;30} returns a 3x3 array)
• SUM(), PRODUCT(), etc. error on invalid single values (SUM(1, "text") returns an error)
• SUM(), PRODUCT(), etc. ignore invalid values in arrays (SUM(1, {"text"}) returns 1)
• Error values are propagated, even in arrays (SUM(1, {1/0}) returns an error)
• Cell references are 1x1 arrays (if A1="text", SUM(1, A1) returns 1)
• 1x1 arrays returned from operations are converted to single values (if A1 and A2="text", SUM(1, A1&A2) returns an error)

NaN and Inf

• Division by zero produces a nice pretty error message
• NaN and Inf in calculations are converted to proper errors

Nulls (possible future behavior)

This is untested for now since we need a more solid type system to make it useful

• Empty cells contain null
• null is coerced to zero when used numerically (if A1 is null, then A1+2 returns 2)
• Empty strings do not coerce to number (if A1 contains a formula producing an empty string, then A1+2 returns an error)
• null is coerced to an empty string when used as text (if A1 is null, then A1+"text" returns "text")

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Comments	Updated (UTC)
quadratic	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 13, 2023 3:17pm

[HactarCE]

This also fixes #518

[davidkircos]

Looks good to me.