Add docstrings and refine the code in CharacterStats and GrowthStats

Author: NathanLovato

godot/combat/battlers/stats/CharacterStats.gd

@@ -1,3 +1,8 @@
+"""
+Represents a Battler's actual stats: health, strength, etc.
+See the child class GrowthStats.gd for stats growth curves
+and lookup tables
+"""
 extends Resource
 
 class_name CharacterStats
@@ -91,9 +96,7 @@ func _get_experience() -> int:
 	return experience
 
 func _set_experience(value):
-	if value == null or value < 0:
-		value = 0
-	experience = value
+	experience = max(0, value)
 
 func _get_level() -> int:
 	return level

godot/combat/battlers/stats/GrowthStats.gd

@@ -1,7 +1,12 @@
-extends "res://combat/battlers/stats/CharacterStats.gd"
+"""
+Uses curves and lookup tables to calculate a battler's stats
+
+"""
+extends CharacterStats
 
 class_name GrowthStats
 
+# level as a percentage of the max_level, in the [0.0, 1.0] range
 var _interpolated_level : float
 
 export var level_lookup : Array = []
@@ -16,7 +21,7 @@ func _set_experience(value : int = 0):
 	Calculate level, which updates all stats
 	"""
 	var max_level = len(level_lookup)
-	experience = value
+	experience = max(0, value)
 	var l = level
 	while l + 1 < max_level && experience > level_lookup[l+1]:
 		l += 1