Metabolism Precision Runtime Errors (#5701)

Because of precision issues with floating point values, metabolism would sometimes runtime and cause performance issues. This PR fixes this.

Fixes #5698 as well.

code/modules/reagents/Chemistry-Holder.dm

@@ -98,7 +98,6 @@
 //returns 1 if the holder should continue reactiong, 0 otherwise.
 /datum/reagents/proc/process_reactions()
 	if(!my_atom || !my_atom.loc || my_atom.flags & NOREACT)
-		equalize_temperature()
 		return 0
 
 	var/reaction_occured

code/modules/reagents/Chemistry-Reagents.dm

@@ -39,6 +39,7 @@
 /datum/reagent/proc/initialize_data(var/newdata) // Called when the reagent is created.
 	if(!isnull(newdata))
 		data = newdata
+	metabolism = round(metabolism,0.001)
 
 /datum/reagent/proc/remove_self(var/amount) // Shortcut
 	if (!holder)

code/modules/reagents/Chemistry-Temperature.dm

@@ -66,9 +66,8 @@
 
 	var/total_thermal_energy = 0
 	var/total_heat_capacity = 0
-	
 	var/was_changed = FALSE
-	
+
 	for(var/datum/reagent/R in reagent_list)
 		total_thermal_energy += R.get_thermal_energy()
 		total_heat_capacity += R.get_heat_capacity()
@@ -76,11 +75,10 @@
 	for(var/datum/reagent/R in reagent_list)
 		var/old_thermal_energy = R.get_thermal_energy()
 		var/new_thermal_energy = total_thermal_energy * (R.get_heat_capacity()/total_heat_capacity)
-	
+		if(round(old_thermal_energy,1) != round(new_thermal_energy,1))
-		if(old_thermal_energy != new_thermal_energy)
 			R.set_thermal_energy( new_thermal_energy )
 			was_changed = TRUE
-			
+
 	return was_changed
 
 /datum/reagents/proc/add_thermal_energy(var/thermal_energy_to_add)

html/changelogs/burgerbb - temperature fixes changelog.yml

@@ -0,0 +1,37 @@
+################################
+# Example Changelog File
+#
+# Note: This file, and files beginning with ".", and files that don't end in ".yml" will not be read. If you change this file, you will look really dumb.
+#
+# Your changelog will be merged with a master changelog. (New stuff added only, and only on the date entry for the day it was merged.)
+# When it is, any changes listed below will disappear.
+#
+# Valid Prefixes: 
+#   bugfix
+#   wip (For works in progress)
+#   tweak
+#   soundadd
+#   sounddel
+#   rscadd (general adding of nice things)
+#   rscdel (general deleting of nice things)
+#   imageadd
+#   imagedel
+#   maptweak
+#   spellcheck (typo fixes)
+#   experiment
+#   balance
+#################################
+
+# Your name.  
+author: BurgerBB
+
+# Optional: Remove this file after generating master changelog.  Useful for PR changelogs that won't get used again.
+delete-after: True
+
+# Any changes you've made.  See valid prefix list above.
+# INDENT WITH TWO SPACES.  NOT TABS.  SPACES.
+# SCREW THIS UP AND IT WON'T WORK.
+# Also, all entries are changed into a single [] after a master changelog generation. Just remove the brackets when you add new entries.
+# Please surround your changes in  double quotes ("), as certain characters otherwise screws up compiling. The quotes will not show up in the changelog.
+changes: 
+  - bugfix: "Fixed a bug that would cause runtimes with chemicals with low metabolism."