Partial creeper explode distance fix, and fix to stop punching mobs into the air.

mods/ENTITIES/mcl_mobs/api.lua

@@ -2501,7 +2501,7 @@ local do_states = function(self, dtime)
 			-- stop timer if out of reach or direct line of sight
 			elseif self.allow_fuse_reset
 			and self.v_start
-			and (dist > self.reach
+			and (dist >= self.explosiontimer_reset_radius
 					or not line_of_sight(self, s, p, 2)) then
 				self.v_start = false
 				self.timer = 0
@@ -2511,7 +2511,7 @@ local do_states = function(self, dtime)
 			end
 
 			-- walk right up to player unless the timer is active
-			if self.v_start and (self.stop_to_explode or dist < 1.5) then
+			if self.v_start and (self.stop_to_explode or dist < self.reach) then
 				set_velocity(self, 0)
 			else
 				set_velocity(self, self.run_velocity)
@@ -3068,7 +3068,7 @@ local mob_punch = function(self, hitter, tflp, tool_capabilities, dir)
 			local up = 2
 
 			-- if already in air then dont go up anymore when hit
-			if v.y > 0
+			if v.y ~= 0
 			or self.fly then
 				up = 0
 			end
@@ -3789,6 +3789,7 @@ minetest.register_entity(name, {
 	immune_to = def.immune_to or {},
 	explosion_radius = def.explosion_radius, -- LEGACY
 	explosion_damage_radius = def.explosion_damage_radius, -- LEGACY
+	explosiontimer_reset_radius = def.explosiontimer_reset_radius,
 	explosion_timer = def.explosion_timer or 3,
 	allow_fuse_reset = def.allow_fuse_reset ~= false,
 	stop_to_explode = def.stop_to_explode ~= false,

mods/ENTITIES/mcl_mobs/api.txt

@@ -108,6 +108,7 @@ functions needed for the mob to work properly which contains the following:
    'explosion_timer'     number of seconds before mob explodes while its target
                          is still inside reach or explosion_damage_radius,
                          defaults to 3.
+   'explosiontimer_reset_radius'	The distance you must travel before the timer will be reset.
    'allow_fuse_reset'    Allow 'explode' attack_type to reset fuse and resume
                          chasing if target leaves the blast radius or line of
                          sight. Defaults to true.

mods/ENTITIES/mobs_mc/creeper.lua

@@ -39,7 +39,10 @@ mobs:register_mob("mobs_mc:creeper", {
 	attack_type = "explode",
 
 	explosion_strength = 3,
-	reach = 4,
+	explosion_radius = 3.5,
+	explosion_damage_radius = 3.5,
+	explosiontimer_reset_radius = 6,
+	reach = 3,
 	explosion_timer = 1.5,
 	allow_fuse_reset = true,
 	stop_to_explode = true,