Evaluate Lua expression {expr} and return its result converted to Vim data structures. Second {expr} may hold additional argument accessible as _A inside first {expr}. Strings are returned as they are. Boolean objects are converted to numbers. Numbers are converted to Float values. Dictionaries and lists obtained by vim.eval() are returned as-is. Other objects are returned as zero without any errors. See lua-luaeval for more details. Note that in a :def function local variables are not visible to {expr}.

Can also be used as a method:

GetExpr()->luaeval()

only available when compiled with the +lua feature