Add Table::newEmpty() that preserves the original behaviour of new(). It can still be useful at times

Modifications::new() expects values for all required fields

Closes #4

See merge request !5

Allow mapping complex types

See merge request !4

cookbook article for https://gitlab.grifart.cz/ivy/server/-/merge_requests/222/diffs#note_69354

See merge request !3

Removed dependency on assert function signature repo

See merge request !2

Replace assertFunctionSignature with phpstan's callable types

See merge request !1