### Godot version

v4.1.rc2.official [46424488e]

### System information

Godot v4.1.rc2 - Windows 10.0.22621 - Vulkan (Forward+) - dedicated NVIDIA GeForce RTX 2060 (NVIDIA; 31.0.15.2802) - Intel(R) Core(TM) i5-10400F CPU @ 2.90GHz (12 Threads)

### Issue description

The native shader generated from (for example) a canvas_item shader has some modified floating point litterals. For example, in the following function, the "43758.5453" becomes "43758.5".

float rand(vec2 x) {
    return fract(cos(mod(dot(x, vec2(13.9898, 8.141)), 3.14)) * 43758.5453);
}

It is probably not a problem in most cases, but Material Maker generates both Godot shaders to preview results and compute shaders to render them to textures (and the end results are not the same). I can workaround the problem (by making sure float literals are not "too precise") for shaders that are provides with Material Maker, but it will remain for user-defined shaders.

### Steps to reproduce

Open the attached project
Open shader_example.tres material
Open the shader in the shader editor
Inspect native code for the material and select the fragment tab

![image](https://github.com/godotengine/godot/assets/6957908/66a8b99a-8c77-43c1-aa67-d768579d0387)


### Minimal reproduction project

[floating_point_literal_bug.zip](https://github.com/godotengine/godot/files/11924814/floating_point_literal_bug.zip)

SL::VariableDeclarationNode *vdnode = (SL::VariableDeclarationNode *)p_node;
			String declaration;
			declaration += _constr(vdnode->is_const);
			if (vdnode->datatype == SL::TYPE_STRUCT) {
				declaration += _mkid(vdnode->struct_name);
			} else {
				declaration += _prestr(vdnode->precision) + _typestr(vdnode->datatype);
			}
			declaration += " ";
			for (int i = 0; i < vdnode->declarations.size(); i++) {
				bool is_array = vdnode->declarations[i].size > 0;
				if (i > 0) {
					declaration += ",";
				}
				declaration += _mkid(vdnode->declarations[i].name);
				if (is_array) {
					declaration += "[";
					if (vdnode->declarations[i].size_expression != nullptr) {
						declaration += _dump_node_code(vdnode->declarations[i].size_expression, p_level, r_gen_code, p_actions, p_default_actions, p_assigning);
					} else {
						declaration += itos(vdnode->declarations[i].size);
					}
					declaration += "]";
				}
				if (!is_array || vdnode->declarations[i].single_expression) {
					if (!vdnode->declarations[i].initializer.is_empty()) {
						declaration += "=";
						declaration += _dump_node_code(vdnode->declarations[i].initializer[0], p_level, r_gen_code, p_actions, p_default_actions, p_assigning);
					}
				} else {