Seventh composite pull request

[hmdne]

Of the things that I want to document, maybe this should first come to mind:

d = DOM { input(type: "text") }
d["required"] = true # Worked
d["required"] = false # Had an unintuitive behavior before
d.attributes.delete("required") # Alternative syntax

# Also:
req = false
d = DOM { input(type: "text", required: req) } # This works now
# Used to require this before:
d = DOM {
  h = {type: "text"}
  h.merge!(required: "") if req
  input(h)
}

In general I develop opal-browser while developing an application, so those features come as what I miss while developing it.

[elia]

Just one thing on how to improve an each implementation, otherwise 👍

[elia]

Since we're iterating we could just yield the two pairs without creating a supporting hash, that way we'd also get the advantage of supporting duplicate keys (which are a thing IIRC)