Include the full input when unable to construct an object

Fixes #361

Author: dkhalanskyjb

core/common/src/format/DateTimeFormat.kt

@@ -115,7 +115,10 @@ internal sealed class AbstractDateTimeFormat<T, U : Copyable<U>> : DateTimeForma
         try {
             return valueFromIntermediate(matched)
         } catch (e: IllegalArgumentException) {
-            throw DateTimeFormatException(e.message!!)
+            throw DateTimeFormatException(when (val message = e.message) {
+                null -> "The value parsed from '$input' is invalid"
+                else -> "$message (when parsing '$input')"
+            }, e)
         }
     }
 

core/common/src/internal/format/FieldFormatDirective.kt

@@ -108,7 +108,7 @@ internal abstract class NamedUnsignedIntFieldFormatDirective<in Target>(
     override fun parser(): ParserStructure<Target> =
         ParserStructure(
             listOf(
-                StringSetParserOperation(values, AssignableString(), "One of $values for $name")
+                StringSetParserOperation(values, AssignableString(), "one of $values for $name")
             ), emptyList()
         )
 }
@@ -142,7 +142,7 @@ internal abstract class NamedEnumIntFieldFormatDirective<in Target, Type>(
     override fun parser(): ParserStructure<Target> =
         ParserStructure(
             listOf(
-                StringSetParserOperation(mapping.values, AssignableString(), "One of ${mapping.values} for $name")
+                StringSetParserOperation(mapping.values, AssignableString(), "one of ${mapping.values} for $name")
             ), emptyList()
         )
 }