Wrong value parsed when having a key that starts with the value of another key using hyphens

[fmeeuw]

When having both foo-bar and foo present in a case class, Ficus attempts to parse the value of foo-bar and assign it to foo. When they both have different types this results in a ClassCastException, however when the types are the same, ficus will assign the value of foo-bar to both foo and foo-bar.

Example that fails with ClassCastException.

import net.ceedubs.ficus.Ficus._
import net.ceedubs.ficus.readers.ArbitraryTypeReader._
import com.typesafe.config._

case class TestSettings(val `foo-bar`: Long, `foo`: String)

val config = ConfigFactory.parseString("""{ foo-bar: 3, foo: "4" }""")
val settings = config.as[TestSettings] // throws java.lang.ClassCastException: java.lang.Long cannot be cast to java.lang.String!

Example that doesn't fail, but assigns the value of foo-bar to foo.

case class TestSettings2(val `foo-bar`: String, `foo`: String)

val config = ConfigFactory.parseString("""{ foo-bar: "foo-bar", foo: "foo" }""")
val settings = config.as[TestSettings2]
println(settings.`foo-bar`) // prints out foo-bar
println(settings.foo) // also prints out foo-bar!

[fmeeuw]

It seems to be a bug in the scala compiler: scala/bug#8831, as pointed out by @jcazevedo from pureconfig.