[BUG]: problem with python and c++ data type conversion

[qqjjdd]

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What version (or hash if on master) of pybind11 are you using?

2.10.4

Problem description

I try to create an ndarray(whose size is 5, and dtype is float) in c++ interface as the return value, which will be passed to a python function as output. I tried this ↓

and this ↓

But all the methods turns out that the python function output data only retains one digit after the decimal point， which does not match the precision of float. For example: the return_data[0]=0.0025783 but the arr[0]=0.0

Where did I make a mistake? Anyone gets any ideas??

Reproducible example code

No response

Is this a regression? Put the last known working version here if it is.

Not a regression

[ljluestc]

#include <pybind11/pybind11.h>
#include <pybind11/numpy.h>

namespace py = pybind11;

py::array_t<float> create_array() {
    // Create a NumPy array with 5 elements, dtype=float
    py::array_t<float> arr(5);  // 5 elements, float dtype
    
    // Access the data buffer and set the values
    auto buf = arr.request();
    float* ptr = static_cast<float*>(buf.ptr);

    // Assign values with high precision
    ptr[0] = 0.0025783f;
    ptr[1] = 1.2345678f;
    ptr[2] = 3.1415926f;
    ptr[3] = 2.7182818f;
    ptr[4] = 1.6180339f;

    return arr;
}

PYBIND11_MODULE(example, m) {
    m.def("create_array", &create_array, "Create an array of floats with high precision");
}