v1.3.1

• convert: Fix incorrect conversion rules for maps of maps that were leading to panics. This will now succeed in some more cases that ought to have been valid, and produce a proper error if there is no valid outcome. (#47)
• function/stdlib: Fix an implementation error in the Contains function that was introduced in 1.3.0, so it will now produce a correct result rather than failing with a confusing error message. (#46)