| ## Removal of deprecated functions |
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| ### Removal of deprecated X.509 functions |
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| The deprecated function `mbedtls_x509write_crt_set_serial()` has been removed. The function was superseded by `mbedtls_x509write_crt_set_serial_raw()`. |
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| ### Removal of deprecated SSL functions |
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| The deprecated function `mbedtls_ssl_conf_curves()` has been removed. |
| The function was superseded by `mbedtls_ssl_conf_groups()`. |
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| ### Removal of `compat-2.x.h` |
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| The header `compat-2.x.h`, containing some definitions for backward compatibility with Mbed TLS 2.x, has been removed. |