In version 10.0, the recognition for input types has been improved.
Depending on the kind of default value, the value is recognized as String, Number or Boolean.

Examples:

app.requires("type", true)

will be handled as Boolean and therefore shows a checkbox in the ask-at-runtime dialog in the user interface.

app.requires("type", "true")   or   app.requires("type", "1")
 will be recognized as String and therefore a text input field is shown in the user interface.

app.requires("type", 1)

will be handled as Numbers with an input field in the user interface, which is restricted to numerical values.