diff --git a/src/main/kotlin/ru/dbotthepony/mc/otm/data/CodecList.kt b/src/main/kotlin/ru/dbotthepony/mc/otm/data/CodecList.kt
new file mode 100644
index 000000000..0466a82da
--- /dev/null
+++ b/src/main/kotlin/ru/dbotthepony/mc/otm/data/CodecList.kt
@@ -0,0 +1,112 @@
+package ru.dbotthepony.mc.otm.data
+
+import com.google.common.collect.ImmutableList
+import com.mojang.datafixers.util.Pair
+import com.mojang.serialization.Codec
+import com.mojang.serialization.DataResult
+import com.mojang.serialization.DynamicOps
+import ru.dbotthepony.mc.otm.core.stream
+import java.util.function.Predicate
+import java.util.stream.Stream
+
+class CodecList<S : Any>(codecs: Stream<Codec<S>>) : Codec<S> {
+	constructor(codecs: Collection<Codec<S>>) : this(codecs.stream())
+	constructor(vararg codecs: Codec<S>) : this(codecs.stream() as Stream<Codec<S>>)
+
+	private val codecs = codecs.collect(ImmutableList.toImmutableList())
+
+	init {
+		require(this.codecs.isNotEmpty()) { "No codecs provided" }
+	}
+
+	override fun <T : Any> encode(input: S, ops: DynamicOps<T>, prefix: T): DataResult<T> {
+		val results = ArrayList<DataResult<T>>(codecs.size)
+
+		for (codec in codecs) {
+			val result = codec.encode(input, ops, prefix)
+
+			if (result.result().isPresent) {
+				return result
+			} else {
+				results.add(result)
+			}
+		}
+
+		return DataResult.error {
+			"None of codecs encoded the input:\n " + results.joinToString(";\n ") { it.error().get().message() }
+		}
+	}
+
+	override fun <T : Any> decode(ops: DynamicOps<T>, input: T): DataResult<Pair<S, T>> {
+		val results = ArrayList<DataResult<Pair<S, T>>>(codecs.size)
+
+		for (codec in codecs) {
+			val result = codec.decode(ops, input)
+
+			if (result.result().isPresent) {
+				return result
+			} else {
+				results.add(result)
+			}
+		}
+
+		return DataResult.error {
+			"None of codecs decoded the input:\n " + results.joinToString(";\n ") { it.error().get().message() }
+		}
+	}
+}
+
+class PredicatedCodecList<S : Any>(codecs: Stream<kotlin.Pair<Codec<S>, Predicate<S>>>) : Codec<S> {
+	constructor(codecs: Collection<kotlin.Pair<Codec<S>, Predicate<S>>>) : this(codecs.stream())
+	constructor(vararg codecs: kotlin.Pair<Codec<S>, Predicate<S>>) : this(codecs.stream() as Stream<kotlin.Pair<Codec<S>, Predicate<S>>>)
+
+	private val codecs = codecs.collect(ImmutableList.toImmutableList())
+
+	init {
+		require(this.codecs.isNotEmpty()) { "No codecs provided" }
+	}
+
+	override fun <T : Any> encode(input: S, ops: DynamicOps<T>, prefix: T): DataResult<T> {
+		val results = ArrayList<DataResult<T>>(codecs.size)
+		var i = -1
+
+		for ((codec, predicate) in codecs) {
+			i++
+
+			if (predicate.test(input)) {
+				val result = codec.encode(input, ops, prefix)
+
+				if (result.result().isPresent) {
+					return result
+				} else {
+					results.add(result)
+				}
+			} else {
+				val i2 = i
+				results.add(DataResult.error { "Codec #$i2 predicate tested false" })
+			}
+		}
+
+		return DataResult.error {
+			"None of codecs encoded the input:\n " + results.joinToString(";\n ") { it.error().get().message() }
+		}
+	}
+
+	override fun <T : Any> decode(ops: DynamicOps<T>, input: T): DataResult<Pair<S, T>> {
+		val results = ArrayList<DataResult<Pair<S, T>>>(codecs.size)
+
+		for ((codec) in codecs) {
+			val result = codec.decode(ops, input)
+
+			if (result.result().isPresent) {
+				return result
+			} else {
+				results.add(result)
+			}
+		}
+
+		return DataResult.error {
+			"None of codecs decoded the input:\n " + results.joinToString(";\n ") { it.error().get().message() }
+		}
+	}
+}
diff --git a/src/main/kotlin/ru/dbotthepony/mc/otm/data/DecimalCodec.kt b/src/main/kotlin/ru/dbotthepony/mc/otm/data/DecimalCodec.kt
index 371e0a017..140bd0848 100644
--- a/src/main/kotlin/ru/dbotthepony/mc/otm/data/DecimalCodec.kt
+++ b/src/main/kotlin/ru/dbotthepony/mc/otm/data/DecimalCodec.kt
@@ -12,12 +12,20 @@ object DecimalCodec : Codec<Decimal> {
 	}
 
 	override fun <T : Any> decode(ops: DynamicOps<T>, input: T): DataResult<Pair<Decimal, T>> {
-		return ops.getStringValue(input).flatMap {
+		val result = ops.getStringValue(input).flatMap {
 			try {
 				DataResult.success(Pair(Decimal(it), ops.empty()))
 			} catch (err: NumberFormatException) {
 				DataResult.error { "Not a valid number for converting into Decimal: $it" }
 			}
 		}
+
+		if (result.result().isPresent) {
+			return result
+		}
+
+		return ops.getNumberValue(input).flatMap {
+			DataResult.success(Pair(Decimal(it.toString()), ops.empty()))
+		}
 	}
 }
diff --git a/src/main/kotlin/ru/dbotthepony/mc/otm/matter/ComputeAction.kt b/src/main/kotlin/ru/dbotthepony/mc/otm/matter/ComputeAction.kt
index 5ea678522..50449c5dd 100644
--- a/src/main/kotlin/ru/dbotthepony/mc/otm/matter/ComputeAction.kt
+++ b/src/main/kotlin/ru/dbotthepony/mc/otm/matter/ComputeAction.kt
@@ -13,7 +13,9 @@ import net.minecraft.world.item.Item
 import net.minecraftforge.registries.ForgeRegistries
 import ru.dbotthepony.mc.otm.core.math.Decimal
 import ru.dbotthepony.mc.otm.data.DecimalCodec
+import ru.dbotthepony.mc.otm.data.PredicatedCodecList
 import java.util.Optional
+import java.util.function.Predicate
 
 class ComputeAction(
 	id: Either<ResourceLocation, TagKey<Item>>,
@@ -21,74 +23,158 @@ class ComputeAction(
 	priority: Optional<Int> = Optional.empty(),
 ) : AbstractRegistryAction(id, priority = priority) {
 	companion object : Type<ComputeAction> {
-		private val constantCodecConcise: Codec<Constant> by lazy {
-			RecordCodecBuilder.create {
-				it.group(
-					DecimalCodec.fieldOf("matter").forGetter(Constant::matter),
-					Codec.DOUBLE.fieldOf("complexity").forGetter(Constant::complexity),
-					IMatterFunction.registry.codec.fieldOf("function").forGetter(Constant::matterFunction),
-				).apply(it, ::Constant)
-			}
-		}
-
-		private val constantCodecVeryConcise: Codec<Constant> by lazy {
-			RecordCodecBuilder.create {
-				it.group(
-					DecimalCodec.fieldOf("value").forGetter(Constant::matter),
-					IMatterFunction.registry.codec.fieldOf("function").forGetter(Constant::matterFunction),
-				).apply(it, ::Constant)
-			}
-		}
-
-		private val constantCodecVeryConcise2: Codec<Constant> by lazy {
-			RecordCodecBuilder.create {
-				it.group(
-					Codec.DOUBLE.fieldOf("value").forGetter(Constant::complexity),
-					IMatterFunction.registry.codec.fieldOf("function").forGetter(Constant::matterFunction),
-				).apply(it, ::Constant)
-			}
-		}
-
-		private val constantCodecVerbose: Codec<Constant> by lazy {
-			RecordCodecBuilder.create {
+		private val constantCodecFull: kotlin.Pair<Codec<Constant>, Predicate<Constant>> by lazy {
+			RecordCodecBuilder.create<Constant> {
 				it.group(
 					DecimalCodec.fieldOf("matter").forGetter(Constant::matter),
 					Codec.DOUBLE.fieldOf("complexity").forGetter(Constant::complexity),
 					IMatterFunction.registry.codec.fieldOf("matterFunction").forGetter(Constant::matterFunction),
 					IMatterFunction.registry.codec.fieldOf("complexityFunction").forGetter(Constant::complexityFunction),
 				).apply(it, ::Constant)
+			} to Predicate { true }
+		}
+
+		private val constantCodecValues: kotlin.Pair<Codec<Constant>, Predicate<Constant>> by lazy {
+			RecordCodecBuilder.create<Constant> {
+				it.group(
+					DecimalCodec.fieldOf("matter").forGetter(Constant::matter),
+					Codec.DOUBLE.fieldOf("complexity").forGetter(Constant::complexity),
+					IMatterFunction.registry.codec.fieldOf("function").forGetter(Constant::matterFunction),
+				).apply(it) { a, b, c -> Constant(a, b, c, c) }
+			} to Predicate { it.matterFunction == it.complexityFunction }
+		}
+
+		private val constantCodecFunctions: kotlin.Pair<Codec<Constant>, Predicate<Constant>> by lazy {
+			RecordCodecBuilder.create<Constant> {
+				it.group(
+					DecimalCodec.fieldOf("value").forGetter(Constant::matter),
+					IMatterFunction.registry.codec.fieldOf("matterFunction").forGetter(Constant::matterFunction),
+					IMatterFunction.registry.codec.fieldOf("complexityFunction").forGetter(Constant::complexityFunction),
+				).apply(it) { a, b, c -> Constant(a, a.toDouble(), b, c) }
+			} to Predicate { it.matter == Decimal(it.complexity.toString()) }
+		}
+
+		private val constantCodecConcise: kotlin.Pair<Codec<Constant>, Predicate<Constant>> by lazy {
+			RecordCodecBuilder.create<Constant> {
+				it.group(
+					DecimalCodec.fieldOf("value").forGetter(Constant::matter),
+					IMatterFunction.registry.codec.fieldOf("function").forGetter(Constant::matterFunction),
+				).apply(it) { a, b -> Constant(a, a.toDouble(), b, b) }
+			} to Predicate { it.matter == Decimal(it.complexity.toString()) && it.matterFunction == it.complexityFunction }
+		}
+
+		private val constantCodecComplexity: kotlin.Pair<Codec<Constant>, Predicate<Constant>> by lazy {
+			RecordCodecBuilder.create<Constant> {
+				it.group(
+					Codec.DOUBLE.fieldOf("complexity").forGetter(Constant::complexity),
+					IMatterFunction.registry.codec.fieldOf("function").forGetter(Constant::complexityFunction),
+				).apply(it) { a, b -> Constant(Decimal.ZERO, a.toDouble(), IMatterFunction.NOOP, b) }
+			} to Predicate { it.matterFunction == IMatterFunction.NOOP }
+		}
+
+		private val constantCodecComplexity2: kotlin.Pair<Codec<Constant>, Predicate<Constant>> by lazy {
+			RecordCodecBuilder.create<Constant> {
+				it.group(
+					Codec.DOUBLE.fieldOf("complexity").forGetter(Constant::complexity),
+					IMatterFunction.registry.codec.fieldOf("complexityFunction").forGetter(Constant::complexityFunction),
+				).apply(it) { a, b -> Constant(Decimal.ZERO, a.toDouble(), IMatterFunction.NOOP, b) }
+			} to Predicate { it.matterFunction == IMatterFunction.NOOP }
+		}
+
+		private val constantCodecMatter: kotlin.Pair<Codec<Constant>, Predicate<Constant>> by lazy {
+			RecordCodecBuilder.create<Constant> {
+				it.group(
+					DecimalCodec.fieldOf("matter").forGetter(Constant::matter),
+					IMatterFunction.registry.codec.fieldOf("function").forGetter(Constant::matterFunction),
+				).apply(it) { a, b -> Constant(a, 0.0, b, IMatterFunction.NOOP) }
+			} to Predicate { it.complexityFunction == IMatterFunction.NOOP }
+		}
+
+		private val constantCodecMatter2: kotlin.Pair<Codec<Constant>, Predicate<Constant>> by lazy {
+			RecordCodecBuilder.create<Constant> {
+				it.group(
+					DecimalCodec.fieldOf("matter").forGetter(Constant::matter),
+					IMatterFunction.registry.codec.fieldOf("matterFunction").forGetter(Constant::matterFunction),
+				).apply(it) { a, b -> Constant(a, 0.0, b, IMatterFunction.NOOP) }
+			} to Predicate { it.complexityFunction == IMatterFunction.NOOP }
+		}
+
+		private data class StringConstantCodec(val fn: IMatterFunction, val symbol: Char) : Codec<Constant>, Predicate<Constant> {
+			val pair = this to this
+
+			override fun <T : Any> encode(input: Constant, ops: DynamicOps<T>, prefix: T): DataResult<T> {
+				return DataResult.success(ops.createString(symbol + input.matter.toString()))
+			}
+
+			override fun <T : Any> decode(ops: DynamicOps<T>, input: T): DataResult<Pair<Constant, T>> {
+				return ops.getStringValue(input).flatMap {
+					if (it[0] == symbol) {
+						try {
+							DataResult.success(Pair(Constant(Decimal(it.substring(1).trim()), it.substring(1).trim().toDouble(), fn, fn), ops.empty()))
+						} catch (err: NumberFormatException) {
+							DataResult.error { "Not a number: ${it.substring(1).trim()} (input string: $it)" }
+						}
+					} else {
+						DataResult.error { "Input string does not match expected operand: expected $symbol, got ${it[0]} (for input $it)" }
+					}
+				}
+			}
+
+			override fun test(t: Constant): Boolean {
+				return t.matterFunction == fn && t.complexityFunction == fn && t.matter == Decimal(t.complexity.toString())
+			}
+		}
+
+		private object PlainStringConstantCodec : Codec<Constant>, Predicate<Constant> {
+			override fun <T : Any> encode(input: Constant, ops: DynamicOps<T>, prefix: T): DataResult<T> {
+				return DataResult.success(ops.createString(input.matter.toString()))
+			}
+
+			override fun <T : Any> decode(ops: DynamicOps<T>, input: T): DataResult<Pair<Constant, T>> {
+				val result = ops.getNumberValue(input).flatMap {
+					try {
+						DataResult.success(Pair(Constant(Decimal(it.toString()), it.toDouble(), IMatterFunction.PLUS, IMatterFunction.PLUS), ops.empty()))
+					} catch (err: NumberFormatException) {
+						DataResult.error { "Not a number: $it" }
+					}
+				}
+
+				if (result.result().isPresent)
+					return result
+
+				return ops.getStringValue(input).flatMap {
+					try {
+						DataResult.success(Pair(Constant(Decimal(it), it.toDouble(), IMatterFunction.PLUS, IMatterFunction.PLUS), ops.empty()))
+					} catch (err: NumberFormatException) {
+						DataResult.error { "Not a number: $it" }
+					}
+				}
+			}
+
+			override fun test(t: Constant): Boolean {
+				return t.matterFunction == IMatterFunction.PLUS && t.complexityFunction == IMatterFunction.PLUS && t.matter == Decimal(t.complexity.toString())
 			}
 		}
 
 		private val constantCodec: Codec<Constant> by lazy {
-			Codec.either(constantCodecConcise, constantCodecVerbose)
-				.xmap({ it.map({ it }, { it }) }, { if (it.matterFunction == it.complexityFunction) Either.left(it) else Either.right(it) })
-		}
-
-		private object ActualConstantCodec : Codec<Constant> {
-			override fun <T : Any> encode(input: Constant, ops: DynamicOps<T>, prefix: T): DataResult<T> {
-				if (input.complexity == input.matter.toDouble()) {
-					return constantCodecVeryConcise.encode(input, ops, prefix)
-				} else {
-					return constantCodec.encode(input, ops, prefix)
-				}
-			}
-
-			override fun <T : Any> decode(ops: DynamicOps<T>, input: T): DataResult<Pair<Constant, T>> {
-				var result = constantCodecVeryConcise.decode(ops, input)
-
-				if (result.result().isPresent) {
-					return result
-				}
-
-				result = constantCodecVeryConcise2.decode(ops, input)
-
-				if (result.result().isPresent) {
-					return result
-				}
-
-				return constantCodec.decode(ops, input)
-			}
+			PredicatedCodecList(
+				PlainStringConstantCodec to PlainStringConstantCodec,
+				StringConstantCodec(IMatterFunction.DIV, '/').pair,
+				StringConstantCodec(IMatterFunction.MUL, '*').pair,
+				StringConstantCodec(IMatterFunction.AT_LEAST, '>').pair,
+				StringConstantCodec(IMatterFunction.AT_MOST, '<').pair,
+				StringConstantCodec(IMatterFunction.MINUS, '-').pair,
+				StringConstantCodec(IMatterFunction.MOD, '%').pair,
+				StringConstantCodec(IMatterFunction.REPLACE, '^').pair,
+				constantCodecMatter,
+				constantCodecMatter2,
+				constantCodecComplexity,
+				constantCodecComplexity2,
+				constantCodecConcise,
+				constantCodecFunctions,
+				constantCodecValues,
+				constantCodecFull,
+			)
 		}
 
 		private val valueCodecConcise: Codec<Value> by lazy {
@@ -140,7 +226,7 @@ class ComputeAction(
 				it.group(
 					TargetCodec.fieldOf("id").forGetter(ComputeAction::id),
 					Codec.list(Codec
-						.either(ActualConstantCodec, ActualValueCodec)
+						.either(constantCodec, ActualValueCodec)
 						.xmap({ it.map({ it }, { it }) }, { if (it is Constant) Either.left(it) else Either.right(it as Value) }))
 						.fieldOf("values")
 						.forGetter(ComputeAction::values),
@@ -179,12 +265,6 @@ class ComputeAction(
 		matterFunction: IMatterFunction,
 		complexityFunction: IMatterFunction = matterFunction,
 	) : Source(matterFunction, complexityFunction) {
-		constructor(
-			value: Decimal,
-			matterFunction: IMatterFunction,
-			complexityFunction: IMatterFunction = matterFunction
-		) : this(value, value.toDouble(), matterFunction, complexityFunction)
-
 		constructor(
 			value: Double,
 			matterFunction: IMatterFunction,