[1.16.1]Change EyeHeight

I want to change player's eyeheight.

I think it's impossible without replacing a vanilla method.

So I used coremod, but my cord caused error.

I think this cause is that 0.5 is double, but I don't know to define float value on JavaScript.

How do I solve this?

I have bad English, so I apologize if I say something strange.

Vanilla Method:

public float getStandingEyeHeight(Pose poseIn, EntitySize sizeIn) {
      switch(poseIn) {
      case SWIMMING:
      case FALL_FLYING:
      case SPIN_ATTACK:
         return 0.4F;
      case CROUCHING:
         return 1.27F;
      default:
         return 1.62F;
      }
   }

Byte Code of Vanilla Method:

public getStandingEyeHeight(Lnet/minecraft/entity/Pose;Lnet/minecraft/entity/EntitySize;)F
   L0
    LINENUMBER 1771 L0
    GETSTATIC net/minecraft/entity/player/PlayerEntity$1.$SwitchMap$net$minecraft$entity$Pose : [I
    ALOAD 1
    INVOKEVIRTUAL net/minecraft/entity/Pose.ordinal ()I
    IALOAD
    TABLESWITCH
      1: L1
      2: L1
      3: L1
      4: L2
      default: L3
   L1
    LINENUMBER 1775 L1
   FRAME SAME
    LDC 0.4
    FRETURN
   L2
    LINENUMBER 1777 L2
   FRAME SAME
    LDC 1.27
    FRETURN
   L3
    LINENUMBER 1779 L3
   FRAME SAME
    LDC 1.62
    FRETURN
   L4
    LOCALVARIABLE this Lnet/minecraft/entity/player/PlayerEntity; L0 L4 0
    LOCALVARIABLE p_213348_1_ Lnet/minecraft/entity/Pose; L0 L4 1
    LOCALVARIABLE p_213348_2_ Lnet/minecraft/entity/EntitySize; L0 L4 2
    MAXSTACK = 2
    MAXLOCALS = 3

Transformer.js:

var ASMAPI = Java.type('net.minecraftforge.coremod.api.ASMAPI');
var Opcodes = Java.type('org.objectweb.asm.Opcodes');

var mappedMethodName = ASMAPI.mapMethod("func_213348_b");

function initializeCoreMod() {
    return {
        'coremodmethod': {
            'target': {
                'type': 'METHOD',
                'class': 'net.minecraft.entity.player.PlayerEntity',
                'methodName': mappedMethodName,
                'methodDesc': '(Lnet/minecraft/entity/Pose;Lnet/minecraft/entity/EntitySize;)F'
            },
            'transformer': function(method) {
                var arrayLength = method.instructions.size();
                for (var i = arrayLength - 1; i >= 0; --i) {
                     var instruction = method.instructions.get(i);
                     if (instruction.getOpcode() == Opcodes.LDC) {
                        var LdcInsnNode = Java.type('org.objectweb.asm.tree.LdcInsnNode');
                        var newInstruction = new LdcInsnNode(0.5);
                        method.instructions.insertBefore(instruction, newInstruction);
                        method.instructions.remove(instruction);
                        print("Transformed!");
                        break;
                     }
                }
                return method;
            }
        }
    }
}

Error:

[main/INFO] [STDERR/]: [java.lang.Throwable:printStackTrace:644]: Caused by: java.lang.VerifyError: Bad type on operand stack
Exception Details:
  Location:
    net/minecraft/entity/player/PlayerEntity.getStandingEyeHeight(Lnet/minecraft/entity/Pose;Lnet/minecraft/entity/EntitySize;)F @51: freturn
  Reason:
    Type double_2nd (current frame, stack[1]) is not assignable to float
  Current Frame:
    bci: @51
    flags: { }
    locals: { 'net/minecraft/entity/player/PlayerEntity', 'net/minecraft/entity/Pose', 'net/minecraft/entity/EntitySize' }
    stack: { double, double_2nd }